help!! witch wood jacobubutch

[needhelps]

i am currently on witch wood and met an enemy called jacobubutch (red color head with a root)
He uses a type of pink color attack on my whole party...my party die off with 100% health taken away??
Is he using death or is it that my characters level are just too low(my random is level43)?
how to prevent his attack or fight him...i may be game over anytime while leveling up my characters
i cant process and play at all right now ...
ANYONE or any expert HELP ME!!
HELP!!

thanks

[Indinera]

the jacobubutch is "just" able to cast death on the whole party

Spoiler: show

coryool makes everybody immune to death states