Tank help pls?

[sdoix]

Ok so i have 3/4 necrolord and t12 perfect cp and i die in f5 in boss fight
also legendary blue whale
it is level 5
my armor is not starred except for 5 starred cp
help?
I use 3/4 sa and livid dagger for clearing
and i use livid dagger as main weapon
what do i do
Im cata 19 btw

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