Returning to the surface using a Magic Mirror before night ends will cause it to spawn as usual.
If the Eye of Cthulhu is not defeated by dawn (4:30 AM), if all players die, or if the Eye of Cthulhu goes too far off-screen, it will despawn. These dashes become faster as the Eye of Cthulhu's life decreases, and it can dash nearly continuously when close to death. In the second phase, it will gain an additional powerful rapid chain dash attack, during which it lets out a higher-pitched roar every time it dashes.
In Expert Mode, the boss spawns more Servants of Cthulhu than normal, as well as 4–5 servants upon transforming. It now lets out a roar every time it charges. It no longer spawns Servants of Cthulhu, and has no defense, but now has increased contact damage. When the Eye of Cthulhu falls below 50% / 65% health (1,400 / 2,366 / 3,016), it transforms into its second form (shedding its iris into a mouth), which rams the player more aggressively three times, then hangs in the air for a period. Afterward, it charges at the player three times in succession, before repeating the cycle. A servant is spawned with the typical hit sound. During the first, it attempts to float directly above the player, while spawning 3–4 Servants of Cthulhu, which drop Hearts and Stars on death. The Eye of Cthulhu has two phases, and is able to fly through blocks in both of them. If they remain underground all night, the boss will not spawn at all. If the player is sufficiently far underground, the Eye of Cthulhu will not spawn until they return to the Surface. If spawning this way, its arrival is announced by the status message " You feel an evil presence watching you.".
#Terraria eye of cthulhu mod#
The Infected Eye is summoned with a Xeno Eye.