Tree of Savior Forum

Warlock another question

Hello.
I would like to know how work invocation skill?
its only works when monsters die and Pole of Agony active or what?
and one more, any reason to take Mastema skill? it has only 1 tick? what the point of this?

mastema is bad and invocation works on any skill/attack as long as you are the one who got the last hit.