Recommended Servant Classes for Babylonia Singularity

Honestly, expect a bit of everything. It's much more varried than camelot. There are a lot of beast type enemies though so servants with bonus against them might be handy (Raikou was my go-to support to rush the nodes). There are bosses in both the knight and rider groups, as well as some tougher avengers so plan accordingly for those. A berzerker will shine in a lot of these instances and anyone with a strong aoe.

There are maybe a handful of fights where your goal is specifically to survive to turn X and not actually deal damage as the boss isn't meant to be killed. So there you might consider raising your mash if you haven't already to keep up a nice defense buff. Servants that are tanky and can stall will help a lot in these battles (any ruler for instance would be a great choice for these).

The most notable encounter is the fight against Quetzalcoatl. She resists or is immune to almost all servants, with the exception of Nero Bride, Hercules, Lancelot (Berserker), and Tamamo Lancer.