Primitive Souls when the game doesn't give you Swimmer 

Amph when he reaches the behemoth content and realises he'll have to log into bc at 3 specific time windows every single day.

Everystage is a courier stage lets be real

This stage is actually really easy. I use my the dark kasli and with her surge (big damage) and the DASTARDLY CURSES (The dogomaro can no longer curse the kasa jizo cat) im easy able to defeat those nasty enemies that ponos so delicately placed in this tricky little stage (is what people like you who struggled (not me) would say). I'm used the word nasty because the wiki use it on the page of Gravi the pixie uber from the elemental pixie uber set

Awakened naala helps on this level, so does doron and idi. Use them next time

this stage is rushable yknow...

Just use swimmer silly

wtf those are considered boomer units now?