Water Sphere

Type	Projectile NPC
Environment	Dungeon
AI Type	Spell AI
Damage	20/40›144›180/60›216›270
Max Life	1
Defense	0
KB Resist	100%
Immune to
Hurt	https://terraria.wiki.gg/wiki/File:NPC_Hit_3.wav
Killed	https://terraria.wiki.gg/wiki/File:NPC_Killed_3.wav

Not to be confused with Water Bolt.

The Water Sphere is a projectile NPC that is fired by the Dark Casters in a volley of three, before teleporting to a different location and firing another volley. It moves steadily in a straight line at 31 mph, passes through blocks unimpeded, and emits a fair amount of light. It can be easily destroyed by hitting it with any weapon or tool capable of dealing damage.

Trivia

Internally, the Water Sphere is considered an enemy, not a projectile. Therefore, it has an NPC ID and statistics like health and defense, unlike actual projectiles.