I've yet to figure out what the red moons do for coxley
increase lucky fuck odds, apply frenzy, and reduce stamina costs. the first two are kinda good, but the reducing stamina costs kinda sucks as it doesn't reduce heart damage.
Edit: my mistake it does reduce heart damage, it's just impossible to notice because any heart damage after the second wave on endless mode is just THAT insane
Edit2: i messed up again, i was right the first time, endless hearts past the third dragon just DESTROY your stamina, no matter whether they're "tender" or not