Frost Golem

Frost Golem is a Hardmode enemy that spawns at the surface and possibly the underground (not yet sighted underground). They spawn rarely, but more commonly during a Blood Moon. They spawn frequently during blizzards, during night and day. (When there is heavy rain in Terraria, the ice biome will have a blizzard.)

It fires fast-traveling, light blue lasers which apply the Chilled Debuff, slowing movement speed. If already chilled, the player may be frozen for a few seconds if hit by another of the Frost Golem's laser attacks. When heavily damaged, they start to move and fire lasers much faster, similarly to the Wall of Flesh.

Frost Golems are very large and can become stuck if they spawn somewhere with a low ceiling. They also appear to have a very small jump height which also makes them prone to getting stuck in even small pits which other monsters can easily escape.

This could be considered a miniboss due to its large amount of health and damage.