Gunbreaker Rotation Guide

Authors

Krom Ulus | discord: krom.ulus
Azazel Raine | discord: azazelraine
Rin Karigani | discord: rinkarigani

Intro

Gunbreaker is a tank job with a focus on continuously building and spending cartridges to deal very high damage inside of strict burst windows. As a basic overview, the rotation is a builder-spender rotation focused on optimizing damage dealt every minute inside No Mercy, which is a 20% damage buff that lasts for 20 seconds after its use.

In this guide we will discuss a number of subjects, beginning with a simple introduction to the priority system for the rotation and then moving into more scenario specific subjects for particular things that alter the rotation in specific ways.

CARTRIDGE GAUGE

The cartridge gauge carries a maximum of 3 cartridges, and is the resource gauge that we manage in order to carry enough cartridges to cast all of our cooldowns within No Mercy.

The actions that will fill the cartridge gauge are as follows:

• Solid Barrel and Demon Slaughter both generate one cartridge upon finishing their combo.
• Bloodfest will completely refill the cartridge gauge.

The actions that will spend cartridges from the gauge are as follows:

• Gnashing Fang, Double Down, Burst Strike, and Fated Circle all spend one cartridge.

NO MERCY AND BUFF PRINCIPLES

Section TLDR:

• All damage is calculated on the frame that an action is cast, not when damage hits a target.
• Use No Mercy off cooldown in accordance with the usage guidelines at the end of this section.
• Do not attempt to clip the GCD to cast No Mercy off cooldown.

We need to establish a couple of concepts first regarding both how damage is calculated and how cooldowns align from GCD speeds to understand how and when to use No Mercy.

Damage Snapshotting

Damage is calculated by snapshotting all buffs and debuffs at the exact moment the server receives the request to use any action. This means that the damage actually applying to and hitting a target is already calculated before it applies to the target, and that actions are still buffed so long as they are used before the buff falls off, not as the damage lands. Debuff-based damage over time effects work the same way, such as Sonic Break.

As a result, when playing fast enough GCD speeds this allows us to buff additional GCDs while No Mercy is still active without needing No Mercy to remain active as that damage lands. It also means that as long as damage-over-time effects fully tick and expire without being wasted, they can go anywhere within No Mercy.

9 GCD No Mercy

An additional 9th GCD into No Mercy is typically possible on GCD speeds faster than or equal to 2.47. Thanks to damage snapshotting, we only have to care that the action is pressed while No Mercy is active, meaning so as long as the total time to press 9 GCDs is less than 20 seconds, 9 GCDs are possible. Buffing the 9th GCD is very dependent on when No Mercy is used relative to the GCD roll and it requires a specific usage timing.

In order to buff a 9th GCD inside No Mercy, we must use No Mercy as a “late weave”, or cast it in between the bottom left and top left corner of our GCD icon. This makes it so that No Mercy will activate right as we press the next GCD, letting us maximize our active usage time of the possible 20 seconds.

No Mercy Usage Guidelines

Certain GCD speeds are poorly aligned to No Mercy and will cause No Mercy to drift rather excessively when attempting to cast it, which can drift No Mercy away from party buffs. To minimize this as much as possible, there are basic usage guidelines for how and when to cast No Mercy.

2.50 GCD

• Use No Mercy as an early weave off cooldown.

2.45 - 2.47 GCD

• Use No Mercy as an early weave without Bloodfest.
• Use No Mercy as a late weave with Bloodfest.

2.40 - 2.44 GCD

• Use No Mercy as a late weave off cooldown.

OPENERS

OPENER NOTES

• The Lightning Shot cast is suggested for pull consistency and raid buff alignment.

  • It does not matter if you are MT or ST, this is always fundamentally true.

• Sonic Break being moved to the 9th GCD in the 2.4n Opener is not a new technique, but for those unfamiliar:

  • It is the least risky choice to keep Hypervelocity inside of No Mercy. (40p gain)
  • If Sonic Break falls out of No Mercy, move Burst Strike back to the 9th GCD.
  • If Sonic Break falls out of raid buffs worth more than 12.1% overall, move Burst Strike back to the 9th GCD.
  • If Sonic Break is cut off by downtime, move Burst Strike back to the 9th GCD.

Rotation Fundamentals

The simplest explanation of the rotation revolves around a filler and burst phase concept. Review the graphic with the text explanation below it.

FILLER PHASE

The goal of this phase is to prepare the appropriate cartridges for No Mercy.

• Complete the Solid Barrel combo continuously to fill the gauge.

• Use Gnashing Fang and Blasting Zone off cooldown ONCE.

• Use Burst Strike only when the cartridge gauge is about to overcap.

  • This occurs anytime the gauge is full and Solid Barrel is the next action to use.
  • You should Burst Strike into No Mercy when you will also have Bloodfest to avoid drifting the usage for any speed, and to also optimize damage on 2.50.

Once No Mercy comes back off cooldown, weave it in accordance with the usage guideline above this section.

BURST PHASE

The goal of this phase is to fit the maximum amount of potency into No Mercy.

GCD cooldowns within No Mercy should be used in the following priority:

• Use Gnashing Fang and Double Down.
• Use Reign of Beasts after Gnashing Fang.
• Use Burst Strike if there is room to do so without pushing out any cooldowns from No Mercy.
• Use Combo Actions when there are no cooldowns available for use.
• Use Lightning Shot if you will be forced out of melee range.

Sonic Break should be used in the following priority:

• Use Sonic Break anywhere necessary to allow better cooldown usage.
• Use Sonic Break as the 9th GCD on 2.4X GCDs to stop Hypervelocity from falling out of No Mercy.
• Use Sonic Break earlier if any DOT uptime is lost from downtime or fight killtime.

OGCD cooldowns within No Mercy should be used in the following priority:

• Use Blasting Zone and Bow Shock in any order.
• Use Bloodfest only upon reaching zero cartridges.

UNIQUE BURST PHASES

Forced 1-Cartridge No Mercy

A situation can occur where a Solid Barrel would be next action before No Mercy when Bloodfest is also coming off cooldown, pushing you to 3 cartridges. Since we’d prefer not to drift Bloodfest, what do we do?

**This graphic is being updated, but the solution is to cast a Burst Strike in place of that Solid Barrel. This will drive you down to 1 cartridge, where then you can cast Sonic Break earlier in your burst window to fill the gap that forms. Gnashing Fang or Double Down (or both) will drift by 1 GCD in the process, but Bloodfest will not.**

COMBO CONSIDERATIONS

Certain combo chains cannot be used during other combo chains without breaking one or the other. It is important to understand what you can or cannot press during a combo chain to avoid losing out on significant potency by mistake.

• Your standard Solid Barrel combo cannot be broken by anything but itself or its AOE counterpart.
• Gnashing Fang and Lionheart are both broken by the Solid Barrel combo, as well as its AOE counterpart.
• Gnashing Fang and Lionheart are also their own independent combo chains that cannot be used or mixed together, or they will break the other.

SKILL SPEED CONSIDERATIONS

Section TLDR:

• GCD cooldowns come off cooldown before No Mercy with faster GCDs. Hold them back into No Mercy.
• 2.40, 2.45, and 2.50 are driftless for party raid buffs and No Mercy.
• 2.45 requires less than or equal to 25ms ping (or plugins) to not clip/drift No Mercy.
• Other GCDs cause some amount of buff drift, potentially drifting No Mercy from raid buffs.
• This does not mean that other speeds are unplayable or bad, but it does add the risk of losing bonus raid buff damage.

Reverse Drift

Skill Speed (SKS) modifies GCD cooldowns by reducing their cooldowns by 0.1% per SKS tier. This is done to help GCD cooldowns remain aligned to your GCD and not clip them.

This benefit is not extended to oGCD cooldowns. This is done intentionally to keep No Mercy aligned to party raid buffs, but it creates misalignment between your GCD cooldowns and No Mercy, as all GCD cooldowns begin coming off cooldown sooner than No Mercy does. This is referred to as “reverse drift”.

The solution to reverse drift is simple - pretend the cooldown reduction does not exist and hold the GCD cooldowns back into No Mercy.

Cooldown Drift

Similarly to how GCD cooldowns do not align to No Mercy with SKS, certain GCDs themselves do not align to oGCD cooldowns either. This causes oGCD cooldowns to occasionally drift into the next GCD because they would otherwise clip the GCD if were you to attempt to use them.

Determining how much a cooldown will “move” from the last position it came off cooldown per use on any given speed is found by dividing the cooldown length by your GCD.

• As an example, 60s/2.50 GCD = 24 GCDs per No Mercy or Bow Shock, meaning they come off cooldown exactly every 24 GCD rolls from wherever you last used them. This means that the oGCD cooldown will never come off cooldown at a different place in relation to the GCD roll.
• On 2.46, it becomes 60/2.46 = 24.39 GCDs, meaning that No Mercy comes off cooldown +0.39 GCDs after the last time it was used. This appears in practice as if it comes off cooldown “later in the GCD roll” from its previous use.

This observed usage point shift eventually accumulates to the point that the cooldown will come back off cooldown at a point that it cannot be used without clipping the GCD, forcing the cooldown to drift to the next GCD and then be used at the earliest usable point.

Animation lock plays a significant role in this, because after pressing any GCD action the animation lock must end before any oGCD may be cast. Casting oGCDs right before the next GCD is about to be pressed would also animation lock the GCD, causing a GCD clip. This limits the room that you can weave oGCDs without clipping the GCD, and that room is both ping dependent and FPS dependent.

• Higher ping results in longer animation lock, reducing the weaving room before GCD clipping occurs.
• In regards to FPS, a new GCD can only begin on a new frame, so a microscopic clip that you cannot visually see occurs while you wait for a new frame to generate showing the GCD as usable to the game client. Technically speaking, this increases the time you can weave because you would have clipped by that amount regardless.

What this means for the rotation is that some GCD speeds are just uniquely worse at aligning to oGCDs, and they will cause more drift than other speeds will over the course of a fight. This can be very important for both raid buffs and usages, and due to how loaded the burst window is at level 100, it becomes very unfavorable to drift out of party buffs due to uncontrollable GCD speed-based drift.

The speeds that do NOT drift No Mercy by any significant amount are as follows:

• 2.50 GCD (0.00s drift per use)
• 2.45 GCD (0.05s drift per every other use) (PING DEPENDENT - ≤25MS TO NOT CLIP OR DRIFT)
• 2.40 GCD (0.00s drift per use)

Those three speeds in particular are the most favorable for staying aligned with party buffs. Going from 2.40 to 2.42 would increase the drift rate because it would take longer for No Mercy to return to the same ideal usage point, and you can only use the cooldown off cooldown once per drift. In specific, it would cause 2.42 * (1 - (60 / 2.42 - 24) = 0.5s of drift per No Mercy. This drift linearly increases or decreases within the respective speed range of 2.40 - 2.44 as you go slower or faster respectively, and the same holds true of 2.45 - 2.47 which can use No Mercy twice off cooldown in between drifts.

Keep in mind that this doesn’t necessarily mean 2.40 is always better than 2.42 or something slower, it just means that the risk of losing raid buff damage over extended periods of time where raid buffs never realign to you is increased when running other speeds, which can potentially be a damage loss depending on the fight you’re in.

AOE Priority

LEVEL 100

Use the Demon Slaughter combo at 3 or more targets.

Use Fated Circle over Burst Strike at 2 or more targets.

Use Gnashing Fang at up to 3 targets.

Personal Mitigation

Great Nebula

• Reduces damage taken by 40% for 15 seconds.
• Increases maximum health by 20% and heals you for that amount.

Rampart

• Reduces damage taken by 20% for 20 seconds.
• Increases healing received by self-healing actions by 15%.

Camouflage

• Reduces damage taken by 10% for 20 seconds.
• Provides an additive +50% parry rate (for a total of 60% parry rate) for 20 seconds. Parrying applies a 15% damage reduction to physical attacks only.

Heart of Corundum

• Reduces their damage taken by 27.75% for the first 4 seconds it was applied, and 15% for the next 4 seconds after that.
• Applies a 900 potency heal that will proc upon a player’s maximum HP reaching less than 50%, or when the buff expires 20 seconds later.

Aurora

• Targeted 18 second heal over time effect that heals yourself or your target for 200 potency every 3 seconds (1200 total).
• It has two stacks, which makes it an effective regen effect to apply to any player that requires extra healing over a certain duration.

Superbolide

• Reduces HP to 1 and renders you impervious to most attacks for 10 seconds.

Arm’s Length

• Provides knockback or draw-in effect immunity for six seconds.
• Applies a 20% Slow effect to enemies that attack you while Arm’s Length is active (enemies will attack you 20% slower, very useful for dungeons).

Party Utility

Heart of Light

• Reduces magic damage taken by 10% for self and party members in a 30y radius around you for 15 seconds.

Reprisal

• Reduces damage dealt by all enemies in a 5y radius around you by 10% for 15 seconds.

Low Blow

• Stuns a target for five seconds. Interrupts any cast.
• Enemies that get stunned repeatedly will slowly develop stun immunity.

Interject

• Interrupts any cast (if it is an interruptible cast).

Provoke

• Places you at the top of the enmity list and grants 5000 potency worth of additional enmity (50,000 if tank stance is active).

Shirk

• Transfers 25% of your current enmity to any targeted party member.

Mitigation Planning

All mitigation is multiplicative. As an example with both Rampart and Great Nebula together, the total reduced damage amount is 1 - (1 - 0.2) * (1 - 0.4) = 52% when put together.

Despite the apparent loss in efficiency, it is optimal in many types of content to stack mitigation together to minimize damage taken during periods of heavy damage or high rates of damage, which typically apply to either tankbuster attacks or dungeon pulls. Efficiency loss is irrelevant in relation to fight-specific mitigation needs.

Understanding the fight timeline is critical to effective mitigation. Every pull should be a live re-assessment of your usage timing on mitigation such as Reprisal and Heart of Light (or any personal mitigation) to evaluate if you can cover additional instances of damage with the same usage.

Give yourself appropriate time to weave mitigation during your normal rotation. Utilize the long active timer of your heavy mitigation to your advantage and use it before the cast if necessary. It only needs to be active for the hit preparation.

The majority of tankbusters can be resolved through a basic strategy of employing either Rampart and Camoflauge tied with Heart of Corundum, or Nebula tied with Heart of Corundum. Some strategies may prefer that you use Superbolide as well.

Heart of Corundum is also techable in the sense that you can use it and abuse the proc timer of Catharsis of Corundum, the 900 potency heal effect. The proc heal does not go off until 20 seconds expire, or a player drops below 50% HP. This allows niche strategies to be employed that allow you to very precisely time a heal to go off at the correct time long in advance.

Dungeon Tips

Attempt to pull wall-to-wall if the healer is capable of handling it.
Use your cooldowns as follows:

General Tips

• Prepull Heart of Corundum early to proc free healing as you are running.
• Apply Aurora to help buffer into any required healing.
• Apply Superbolide as needed if healer help is required.

First Wall to Wall:

• Rampart and Camoflauge
• Heart of Corundum (off cooldown)
• Reprisal
• Low Blow (off cooldown)

Second Wall to Wall:

• Great Nebula and Arm’s Length
• Heart of Corundum (off cooldown)
• Reprisal
• Low Blow (off cooldown)

This plan works for the majority of dungeon encounters. However, this may not work out due to poor party DPS and you may have to alter cooldown usage. There’s nothing wrong with taking the next few pulls slow if more cooldowns had to be used than normal.