Also, how was Ansur? I wasn't able to defeat him without the Globe. The AOE reaction damage was a bit much, that and his countdown is 1 turn rather than 2.
Just destroy the pillars, that gives everyone around the pillar elemental resistance for two turns. Can easy be destroy in a single attack if using a blunt weapon.
Trigger the reaction (he just do it one time per turn) with someone that can tank the damage (elemental resistance and good hp is more than enough) just be careful that they are apart from the other characters
For the countdown attacks just elemental resistance and be at max hp should be eneough (at least it's for me). In any case with the dps you should have at that point of the game he only have time to do it once