Minfrost

Description
Will target random tiles, firing a single icy sphere that applies 1 stack of on the target.

The Minfrost moves through random tiles on their side of playfield, one tile a time.

Strategy
Minfrosts are dangerous due to their Frost effect, but are only truly potent when given enough time, so you can focus on those later, while first dealing with more troublesome enemies like Hailcasters or Manticores. Minfrosts will likely only start firing a near-ceaseless stream of shots if you willingly let it live long enough.