Mechdusa - Official Terraria Wiki

Mechdusa is an early Hardmode boss exclusive to Get fixed boi worlds. Technically, it is not considered a separate boss, but is merely a combination of all three mechanical bosses. It resembles a large serpentine-like creature composed of the three bosses: The Destroyer's head is attached to the Skeletron Prime's head, and The Twins are individually connected via tendrils to Skeletron Prime's eye sockets instead of to each other. There are also two extra Probes attached to The Destroyer's head.

Mechdusa, UnAnything Wiki

Medusa - Official Terraria Wiki

What boss am I missing? I went through the wiki and can't figure

Weapons & Equip - mechdusa pet

Get fixed boi - Terraria Wiki

Just found out about legendary mode, I guess I'll try : r/Terraria

Greater Healing Potion - Terraria Wiki

Mechanical Bosses, Villains Wiki

What boss am I missing? I went through the wiki and can't figure

Bananarang - Terraria Wiki

Terraria Drawing 608 - Mechdusa : r/Terraria

How do you summon all three mechanical bosses?

Moon Lord - Official Terraria Wiki

Terraria - Legendary Difficulty Mechdusa (Mechanical Bosses)

Skeletron Prime, Total Terraria Universes Wiki