Lord Marrowgar is on the PTR tonight, and he's already been downed by a number of groups and guilds. Remember, however, that this is the test realm so there's a good chance the boss is undertuned and will be a bit harder come patch 3.3. Or not, Lord Marrowgar (who has less health than someone like Lord Jaraxxus) may just end up being a 'gimme' boss to ease you into progression. Either way, don't read too much into his difficulty tonight.
Even if he's not perfectly tuned yet, the testing has given us some idea of how his fight will go. His notable abilities are...
- Whirlwind - Just what you would expect, a physical damage AOE. When it lands, it also applies a DoT. Lord Marrowgar will announce the ability before he uses it, so your melee will want to get out of the way so they don't get hit with the bleed.
- Saber Lash - Seasoned raiders will know this ability well. It's an incredibly powerful melee strike that splits its damage across three targets (on 25-man, two targets on 10-man) so you'll want all of your tanks standing together. That way, nobody gets 1-shot by it.
- Coldflame - A line of (cold) fire spawns, and you must not stand in it. Do not stand in the fire. Seriously, people.
- Bone Spike Graveyard - Lord Marrowgar throws a bone spike in a chosen direction, and anybody directly in the line of fire will be impaled. The rest of the raid will need to DPS down the spike to free impaled players. It can be avoided, and it will not hit targets being hit with Saber Lash.