Sandalphon GO using the affliction block/tank trigger strategy with D'Art that Crow pointed out. I used the Attar + Kubera combo in this video as well, for those that are puzzled by why I like it so much - there're a lot of non-AoE OD in this GO, and those two nullified a large number of them.

If you don't have affliction block himes, and your fire grid sucks so SR Amon is not an option, but you have a lot of cleansers, you can try the heal turtle strategy with Andromeda. I AAB-ed the first 4 waves but needed to do Sandalphon manually. Tedious and technically not foolproof, but worked out pretty well for me.