actually, i'm talking ultimate... and one unlucky raging burst from the boss can have them send a kami that low at about lv25.... we're talking 9 hits of about 1.2k (-20% atk and no defenses).
but expert can do so too if you're killing hundreds in a day... cause they are set up to have more HP and do more damage each time they're killed (it's just exponentially faster on ultimate compared to expert).
in fact, i started seeing my HP (roughly 15k-16k on my dark team) take a sharp dive around lv45 ultimate fights.... that's the point where i might need a heal or two if i solo, or need to stick to burst time