I have defeated all the bosses but the last one and take it from me, it does not even
matter how much life he has all you need to know is his weaknesses and you should have a
plan for when your players get injured or downed. i have a simple one, i have all my ppl
holding water of life and psy crystal i usually have at least 2 of each and if sum 1 gets
critically hurt i heal them with the psy 'cure'.
anyway just keep your ppl alive and with full psy you can beat any boss (exept the evil 5
headed dragon at the end, but you dont need to worry about that for now) also i forgot to
keep a steady flow you should set up your ppl so that one of them can do full restore and
that no matter what that person can be revived over and over again. it may be a very slow
process but if you do it right you can beat any boss first time every time

you also need to have the trident to break posiden's barrier and that is all it is good
for