Sry I actually have good info on it now, the Impact of the meteor spawning does do a little bit of damage. The actual chain does little to no damage but snares you for 20 seconds. The thing that killed us in this is Pyrrhic Remains. This is the molten AoE he put on the ground in the video it does roughly 7k every half a second. Also if a person dies or gets to far away from the meteor they are attached to it will explode. But for the most part right now we are trying to find easy way of mitigating that damage...
Here's a Log for that phase and what the Molten Pillars do to a tank - www.esologs.com/reports/AWgdfn9mXv6GFB4J#fight=3&type=damage-taken&view=events&target=21&start=461560&end=506411 Here's another for DPS - www.esologs.com/reports/AWgdfn9mXv6GFB4J#fight=3&type=damage-taken&view=events&target=23&start=461560&end=506411