I just cleared layer 8 on the first dungeon 10 min ago. You can try arcane, its very doable. Prioritize Runecloth Wrappings and the other power where it gives a permanent 2% buff to fireball, frostbolt and arcane blast per vase broken. The patch notes said that they were going to nerf Runecloth Wrappings from 2000% to 500%, but it is still 2000% for some reason. Also in my first run on layer 7, I wasn’t able to get a single RW anima and still managed to clear it.
Just in case you don’t know, Runecloth Wrappings makes it so your next Frostbolt, Fireball and Arcane Blast cast while invisible does 2000% increased damage. The beauty of arcane is with Greater Invisibility, you can land 4+ Arcane Blasts because there is a 3 second shield wall effect from the skill that lingers even after you’re visible and throughout that duration, you’re still considered ‘invisible’.
Rotation: Time Warp, Arcane Power, ToTM, Invis, Arcane Blast, PoM, Arcane Blast x3