Bigger, more powerful magic blasts pop through 2 layers of Bloon.
Arcane Blast is the second upgrade of Path 1 for the Wizard Monkey in BTD6. It increases projectile size of the Wizard Monkey's magic bolts, and it allows them to pop through 2 layers per shot. This upgrade does not increase damage of any other attacks.
It costs $510 on Easy, $600 on Medium, $650 on Hard, and $700 on Impoppable.