When CPU is a Better Gamer lol
Like man jesus... I'm glad I roll for Osiris than... If you want to know why the damage is so high?
To put it simple Osiris increase ALL damage done by ally during her ultimate. The effect will not end until her HP drop to 0. Also death during this phase does not kill her. Basically she's the best unit for you to play while letting your ally do the damage. You can dodge lethal attack or boost overall damage with ultimate.
TBH it is possible to keep her ultimate forever in the game if you do a double healer team. This girl is pretty much Surtr from Arknights... The strongest buff move but only if you can keep her ultimate form alive. Once that form dead you will have to recharge ot again lol
Well TBH you still should save for Hera or any OP support. It should be obvious now... This game meta isn't your main unit... Its the support CPU lol
They are a better gamer than you lol