Mortoculus

Mortoculus is a Nightmare Mode Boss that can be summoned with the boss summoning item in mid-nightmare mode biome. It is a large eye with two purple and two blue tentacles coming out of it.

Behaviour

 * Mortoculus is able to fly through blocks. It attempts to ram into the player, like the Eye of Cthulhu's expert mode attack. It spawns 3-4 Mortuis, which drops Hearts and Stars. When it gets to 100000, it turns into Phase 2. In Phase 2, Mortoculus randomly turns invisible, and while invisible cannot take damage. It becomes visible soon after, but for 2 seconds after it is visible, it can deal twice as much damage. It can also inflict the Grabbed debuff. While fighting Mortoculus, your vertical movement is cut by 50%.

Expert Mode

 * When Mortoculus gets down to 450000, Mortoculus transitions to Phase 3, in which it turns invincible and summons Ocularis and Opticaris. After they are defeated, Mortoculus is vulnerable again but it's damage is multiplied by 25%.

Attacks

 * Mortoculus shoots soul projectiles that home in on the player that disappear after 3 seconds.
 * They do 70 / 90 Damage. When it transitions to it's second phase, it is able to shoot bouncing balls of fire.

Stats

 * 256000
 * 100000 (Transitions to Second Phase)
 * 97 / 107 Damage (Melee)
 * 126 / 138

Drops

 * Ochinium

Mortoculus will drop one of the following weapons:

 * Occhionic Staff
 * Vedere Blade