Lava Crab: Fri Feb 26

Ok, the easiest way we planned this out was to have groups setup, we did the following it may or may not work for you.

1 Healer 1 Range 1 Melee - Back Left
1 healer 1 Range - Back Center
1 Healer 1 Range 1 Melee - Back Right
1 Tank - Top Left
1 Tank - Top Right

Now what this means is that 5 seconds before bonestorm people ran into positions. (Obviously using stack up before bonestorms)
The positions I'm talking about are pretty broad in terms of where you actually do them, but basically you make sure there is a large gap between your groups but with the back center team in range of both back groups.

The reasons you have your tanks way in the front is for an extra safety net, I'll explain in a bit.

Bonestorm happens.

He charges the back left group (As soon as you see him moving towards the group, the group starts to run to the center group)
He charges back right group (Back group moves as soon as he starts moving towards them and back left repositions)

He charges either tank in the far front of the room (YAY, lots of downtime as the tanks don't get hurt by bonestorm and don't even have to move out of it if they wish not too)

#1 Most helpful tip.
Marrows hitbox (the red circle around him when you target him) is his "main" bonestorm area. If you are within the hitbox you get hit for 10k, if you are outside the hitbox that significantly drops to 2kish.
#2 Surviving is key.
Your job is to survive, hence why our melee don't run over to a bonespike, it's the ranged job to burn them down, because if he happens to choose a melee you now have a bonestorm on top of a bonespike.
#3 BOP people if they do get Bonestorm/Spiked at the same time.

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We actually all spread just as he starts to bonestorm to see where he moves to, then DPS the spike asap until we know he is about to move again and then spread out - a bonestorm on a group near the spike is not going to end nicely! We made sure the healers (we had 3 btw and 2 R,3M) spread out so they covered the room.

Getting a taunt in just before he comes out of bonestorm is vital as I found he usually moves to someone who doesnt have time to get far enough away from him to avoid getting 1-shot when he becomes active. Took me a try or two to get the timing sorted - soon after the 3rd spike during bonestorm he becomes active I think...