Something I have noticed with the PoS bosses in general is that the faster you can burn them down the less you have to deal with inexpected boss moves. Last night I tried a few different tactics with Garfrost and finally the tactic which worked best and seems like it might be one of the better ways to do this guy was to park my team on the right hand side of the steps but facing to the left and not the steps and actually moved over so that I could tank him at the bottom of the steps. This allowed me a bit better movement than at the bottom of the steps and the big advantage I found was that he needed to go further back each time and allowed me more time to heal and also it broke line of sight and so removed his buff.
UPDATE: I downed Garfrost again last night and the above strategy does work pretty well, it allows time to regroup if the rocks have knocked toons out of formation and also for everyone to heal up if needed.
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