Underground Beam for Priest of Sun on Fortress

Priest of Sun mob can shoot their beam into the ground making it invisible to the player.

Video: https://youtu.be/_0YVz82tcNk

Priest is the rare in bottom left of the video and you can see the beam shooting but not being visible due to terrain differences.

In general the Priest needs a nerf on engagement distance and tracking speed; they are on par with how bad the Lost Men Sorcerers were before v0.2 that could detonate corpse or drop meteors from 2-3 screens away.