Ok, was barely able to clear Ragnarok without an Elixir today with:
Cassiopeia (Black Propaganda), Amon, Baphomet, Nergal, Konohana Sakuya, as well as Acala and Sun Quan being backup.
Crom Cruach (at 40% assault/15% hp) and Fafnir (40%), and ~72% or so assault from weapon grid IIRC
My Acala has ~37k atk while everybody else is in the 30-32k range

The... sub-par damage of a full burst including three R's is noticable :P