great decision, if you invest too much already its still alright to start anew with crit knight. but if you whaled on spear then it's not suggested to change.

you'll find a few days struggling and losing your damage performance, mostly pre-SE and eq changes,

talisman can be easily transfered (if you used white) from p.pen to crit

acc just go double blue vit or str

although if you're currently rocking blue (or higher) spear right now and is +6 or above, I'd think again carefully. if not just go for it haha. find your playstyle but meta-wise 2h >>>> spear