Killed him weeks ago, but thought I'd share this to possibly help out some people first coming on the fight or having any issues. Nobody cares that you have killed it and if it's easy for you now with the strategy you repeatedly used and wiped with for day(s). I assume everyone has full knowledge of the encounter. This strategy is meant for people who have not yet completed the encounter, as it is perfectly viable to just do it the 'normal' way. I usually wrote guides on maintankadin during ToT, such as solo tanking Megaera. I have not this expansion or for awhile, but this is the most pristine strategy for minimizing slices and raid damage. I will explain why later.
NEW (READ THIS):
Pros: No group goes over 1 stack of slice, and only 8 slices with one being completely immuned (the raid thus only takes a total of 7 slices, as opposed to 9). With gear, this shouldn't be too critical, but it may help a guild struggling by reducing the healing requirement.
1. 3 groups split evenly to the left, right, and behind the boss. Tank is in front of the boss.
2. 2 tanks - one tank starts on Gruul, the other taunts each slice into each group going left -> back -> right. The slice taunting tank keeps it after the third slice, and now becomes the one tanking Gruul in front of the boss. The other tank becomes the one taunting slices now into left -> back -> right (for a total of 6 slices now), and then the tank roles switch again.
3. 7th slice can be SOLO SOAKED (immunity taunt by a paladin, zen med by a brewmaster, etc.). Doing it on the 7th one will mess up his slicing timer and force him to totally SKIP a 9th slice.
4. For the last slice (the 8th slice), taunt it to the left.
For the intermission, if you gain threat right after an overhead smash, the boss will fixate on the tank for a period of time and cause him to do nothing. This will get more repeatable each week as the tank gets more familiar, but again this is not necessary to complete the encounter.
OLD (OBSOLETE DOESN'T MATTER ANYMORE WITH NERFS):
What you get from this strategy:
- Only 8 total slices (down from 9), with two being immuned (of which one of these is solo soaked as opposed to group soaked).
- Only 2 tanks, allowing an extra DPS to beat the enrage.
- The raid never taking more than 2 slice debuffs for increased safety.
What you require to do this strategy:
- 2 tanks capable of solo soaking at least one slice (immunity, heavy damage reduction with externals, etc.)
- 4 additional players capable of surviving a slash with a tank (This could be 3, but 4 is safer.) These player classes are suited to rogues and mages who can drop their slice debuffs with Cloak of Shadows and Greater Invisibility, but other roles may apply.
Strategy:
1. Form 2 groups with players split evenly as usually done on Heroic. Form a 3rd group which will be the "invulnerability group" that is capable of moving behind the boss to soak with the tank. These players will also ideally be in the 2 main groups, and can drop stacks and move to this position when needed (i.e. mages, rogues).
2. Follow this rotation:
First tank taunting 3 slices:
Slice #1/#2: Tank #1 in Group #1
Slice #3: Tank #1 in Group #2
Second tank taunting 4 slices:
Slice #4: Tank #2 in Group #2
Slice #5: Tank #2 Group #3 (rogue/mage/invuln group behind boss)
Slice #6: Tank #2 in Group #1
Slice #7: Tank #2 IMMUNITY (bubble or solo soak ability) in front of the boss (SOLO SOAK). Note any player can do this. A holy paladin or ret paladin could taunt and do it if need be because of tank issues. The key here is you WANT Gruul to hit less than 4 players, and 1 immunity player is obviously the safest.
Third tank taunting 1 slice:
Slice #8: Tank #1 in Group #2
3. Survive the rampage. It is possible to bug Gruul out by taunting/attacking him as a tank after he Smashes, having him fixate on you and do nothing for a period of time. Nonetheless, just survive and don't stand in bad.
4. Repeat.
This is a total of 8 slices only, instead of 9, and one is immunity. Thus you have two less slices hitting the raid, and nobody in the raid ever goes over 2 stacks besides the tanks who don't really matter if you do it right. Repeat this on Rotation #2/#3. The reason for this order is solo soaking on the 7th slice messes up his ability timer and he skips a slice.
Rarely I have seen him use a 9th slice, if he does, then Ardent Defender, bring it to a group with low stacks, or just survive. 5% of the time or lower has he ever 9th slice if done properly. I do this every week.
Hope this helps someone. This strategy puts more responsibility on the tanks rather than the majority of the raid, and requires them to communicate for external CDs in the event they are getting trucked. Overwhelming blows may not drop during Rampage, but the damage shouldn't be an issue if you coordinate properly.
-Galiks/Galice @ Kil'jaeden
Edit: As a note to those posting who have already killed this: thanks to the majority of you for your feedback! I'm sure after you wiped on it for a night(s) and are now just pure experts on this fight, you also have tried to help other guilds rather than just make snarky remarks to those who try.