Arms functions on a priority system with some conditionals, but you'll get very far making sure you press Mortal Strike on Cooldown. The more tagets you add, the more complex the standard rotation becomes with more buttons available if a target is below 20% (or 35% with Massacre).

In 9/10 AoE or cleave pulls you'll have a target with a higher kill priority than the rest. Pressing cleave on X amount of targets might be mathematically optimal, but more often than not, putting more damage into the target that is the barrier to pulling the next pack is the bigger time gain in a M+ environment.

Slayer Opener

1. Charge
2. Rend
3. Thunderous Roar
4. Avatar
5. Colossus Smash
6. Mortal Strike (Until no more resets)
7. Bladestorm (+ Stormbolt)
8. Mortal Strike
9. Skullsplitter (If talented)

Slayer Standard Priority

1. Apply or reapply Rend
2. Execute with Sudden Death and 3 Marked for Execution stacks OR if juggernaut is falling OR if Sudden Death is at 2 stacks or about to fall
3. Overpower with Opportunist
4. Mortal Strike
5. Skullsplitter
6. Overpower
7. Reapply Rend in pandemic window
8. Slam

Pandemic is the term used when adding to a damage over time effect duration. You can use the ability again at 30% duration to "pandemic" it to 130% duration.

Slayer Execute Priority

1. Overpower at less than 85 rage, Overpower Buff is less than 2 stacks and Opportunist is procced
2. Bladestorm if 2 Executionser's Precision and Colossus Smash is up or if Colossus Smash is morethan 15 seconds away
3. Skullsplitter if less than 40 rage
4. Mortal Strike with 2 Executioner's Precision
5. Execute if above 20 rage
6. Overpower

Slayer Cooldown Rotation

1. Thunderous Roar
2. Avatar if Colossus Smash is up or 5 seconds away (for full overlap)
3. Colossus Smash
4. Bladestorm if Colossus Smash/Warbreaker is more than 5 seconds away or if Colossus Smash is applied

Slayer Cleave Priority

1. Apply or reapply Rend with Thunder Clap
2. Skullsplitter (Sweep)
3. Execute with Sudden Death and 3 Marked for Execution stacks OR Juggernaut is falling
4. Overpower if at 7 stacks of Tier and 2 charges
5. Mortal Strike
6. Execute with Sudden Death and 3 Marked for Execution stacks OR Juggernaut is falling OR Sudden Death is falling
7. Cleave if Fervor of Battle is talented
8. Overpower
9. Slam

No change in priority comes from the fact that we just apply Sweeping Strikes as much as possible. Its worth holding Sweep a few seconds to cleave a Colossus Smash. The execute priority above also stays true.

The opener changes a little:

1. Charge
2. Thunder Clap
3. Thunderous Roar
4. Sweeping Strikes
5. Avatar + Colossus Smash
6. Bladestorm (+ Stormbolt)
7. Mortal Strike

Slayer AoE Priority

1. Apply or reapply Rend with Thunder Clap
2. Cleave
3. Execute with Sudden Death if Imminent Demise stacks are less than 3
4. Overpower (Dreadnaught and Sweep)
5. Execute if less than 2 Executioners Precision stacks (Sweep)
6. Mortal Strike with 2 Executioner's Precision stacks and Sweeping Strikes
7. Execute if any amount of Marked for Execution is on the target
8. Overpower (Strength of Arms and Sweep)
9. Mortal Strike (Sweep)
10. Skullsplitter (Sweep)
11. Overpower
12. Thunderclap

The opener changes a little with this build:

1. Charge
2. Thunder Clap
3. Cleave
4. Thunderous Roar
5. Sweeping Strikes
6. Avatar + Colossus Smash
7. Cleave
8. Overpower (OP and Cleave until both are on CD)
9. Bladestorm (+ Stormbolt)

General optimizations

• Chargeweaving when at low rage is a minor optimization to do. Ideally you walk out into charge range right after an auto swing and a GCD is incurred and charge back in as the GCD is ready again without losing uptime.
• You can use Parry Hasting to generate a gazillion rage. Intervene your tank while having Die By the Sword up to Parry Haste your auto attacks.

Crafts and Embellishments

Dawn/Duskthread lining on any lower budget armor piece (bracers/cloak fx). Whichever one is better for you will likely change throughout gearing, but BiS profile uses double Dawnthread. Sims are done at a conservative 60% uptime.

If you are in a guild where progression is end all be all, weapon (Ascendance + Writhing Armor Binding) is a good craft if you aren't lucky in the first week. If you are looking for BIS down the line, any of the Dawnthread Lining craft is gonna be the play on cloak and bracers.

Stats

1. Item level
2. Haste
3. Crit
4. Mastery
5. Vers

Please for the love of god simulate your character on www.raidbots.com if item levels are close.

Trinkets

Eye of Kezan and House of Cards are your BiS trinkets. Improvised Seaforium Pacemaker, Reverb Radio, Mechano-core Amplifier and Suspicous Energy Drink are all good options for M+ at their max item levels.

Enchants

Chest - Crystalline Radiance (main stat) Legs - Defender's Armor Kit Rings - Raidant Haste (at high item level, simulate your options) Weapons - Authority of the Depths

For your tertiary stat enchants you can take whatever you want to. Avoidance is guaranteed damage reduction (on things it works on) and is in general recommended. Speed and Leech are both useful in other scenarios, but Mobility is not something we lack as warriors.

Consumeables

Flask - Alchemical Chaos Food - The Sushi Special. Potion - Tempered Potion Weapon Rune - Whet/Weightstone or Mana Oil. Whichever is cheapest as they are most likely all within variance of eachother. Sockets - Deadly. With Culminating Blasphemite (epic gem) you'll need unique colors. "Quick" versions of the different colors are your best bet. This is going to be a simulation question in 9/10 cases.

Races

Void Elf, Dwarf, Tauren, Human, Mechagnome and Mag'har Orc are all very close to each other. Void Elf teleport may be useful in some one off encounter along with Dwarf Stoneform being able to remove some debuffs in raid