
In its first form, Retinazer will fire lasers at the player at a steady but somewhat slow rate. Additionally, the fight becomes considerably harder if both eyes are on their second form. It is a good idea to focus on one eye, since the fight becomes easier if a single eye has been defeated. When one is destroyed, the other will continue attacking in the same pattern. Each Eye transforms independently once reduced to 8,000 / 12,000 HP (Retinazer) / 9,200 / 13,800 HP (Spazmatism) the other eye remains in its original form until it is reduced to the appropriate amount. When an Eye is reduced to 40% of their maximum health, it will transform, gaining a slight boost in offense and defense. Retinazer is distinguished by its red iris and lasers, while Spazmatism can be identified by its green iris and cursed flames projectile. They have a combined health of 43,000 / 64,500, shared between them. The Twins, as the name suggests, are two separate monsters, both of which must be defeated. The Twins must be killed before dawn (4:30 a.m.), otherwise they flee and despawn. Use a Mechanical Eye during Hardmode at night.This method will only work if The Twins have yet to be defeated Note that this condition is shared with the rest of the mechanical bosses, which increases as more of the three are defeated.

They will then have a 10% chance of appearing when night falls.


The Twins can be spawned by fulfilling either of these conditions:
