Hi im a new in this class so I just want to ask does Timeshift is a must used skill in a boss fight? I know it's essential for crowd crontroll against mobs but what about against boss? is it effective?

Sorry for the noob question, its just that I dont wanna waste the free plats I have if I decided to add Frost on my arsenal & ending messing up.

My skills are (Lv16)

Fire
Lightning
Timeshift
Heal