I would readjust the difficulty of the event battle with the tentacles, of 6 fights I lost within 3 turns either from egg spam or multiple axe attacks 5 times and I haven't won against them once in over 15 or so tries.
Viewing post in The Draw of Gravid Power jam comments
all you really need to do is make is so they can't just instakill you in 3/4 hits, they have that egg move and they can all cast it on after the other, just make it to where only one of the tentacles can do that per battle, that way you can focus down on that one before the other 2 and stand a bit of a better chance.