What we do is have our paladin off tank, we found out that the 10 stacks build up rather slowly so we have the dps burn on raffle then (so paladin can grab hate at his own pace) when its time to nuke the ever living daylights out of the slugs we have everybody transfer damage onto that slug when it goes super and he HGs.
I as the static warrior just handle the burst damage of swarm from raffle with inner beast and I can do it quite comfortably. On the third phase there's no tank swap required. Basically slug does a lot of constant damage which paladins are better at dealing with and raffle at that point does burst damage which warriors are better at dealing with.
