my thunder team (19atk) is doing more damage and its easier than my main team light that has 22k atk
my T team are mordred with baal, perun(using testudo helps me greatly with boss burst skill), skuld and sol
try doing it with modred if you got her unlock together with baal, ama~being fire she take more damage so better use another back up healer beside her, nike and indra (if you got spare gems try gatcha for perun)
mordred debuffs is like having extra 3-4 kami doing damage per turn
and theres blind and charm that make boss skip or miss every turn