Jetshift/Crystal Wyrm

Crystal Wyrm is a post-Moon Lord miniboss that spawns in Space. It is 52 segments long, with the body segments carrying a Sky Spawn each. 25 Sky Spawns can be defeated to instantly finish off the Crystal Wyrm.

Sky Spawn
The Sky Spawn will appear when a body segment of the Crystal Wyrm has been hit, and they will chase down the player indefinitely while firing ice projectiles.

Trivia

 * In an earlier version of the mod, Crystal Wyrms had infinite HP. However, they were not immune to the effects of The Stun-Loch Obliteration, which meant that if the player had one in hand, they could use it to defeat the Crystal Wyrm instantly. However, accuracy was required to do this, as the head would be the main target.