Overview
Skeletron Prime is a boss in Terraria, rendered as a composite of 5 NPC segments. This guide pulls together the official spawn rules, drop table, and progression context so you can decide when to attempt the fight and what to bring.
How to summon
Mechanical Skull at night (Hardmode).
Notable drops
- Skeletron Prime Trophy (1 in 10)
Fight composition
Skeletron Prime is composed of 5 pieces (Skeletron Prime, Prime Cannon, Prime Saw, Prime Vice, Prime Laser). Plan your weapon choice around hitting all parts — piercing weapons or wide AoE tend to outperform single-target damage.