Acolyte of Chayula - League Starter/SSF - Off-Meta - Hexblast Monk to get to Endgame (and beyond)

Hey! Just a question;

Does having 2 curses up actually affect Hexblast? You say its a massive damage spike, but Hexblast says it only consumes *a* curse.

Or did you mean its a damage spike because of the additional penalties afflicted by having a second curse?

Just a little confused, and would love your input :)