Weapon Combining

Weapon Combining is a skill possessed by Hector in Castlevania: Curse of Darkness. It is unlocked in the Abandoned Castle when Hector finds his first material in a chest.

Hector, as a Devil Forgemaster, is also able to create new weapons, armors, and helmets with materials. Using materials, Hector can create basic weapons and may then combine them with other materials or other weapons to create more powerful ones. Materials can be found in chests, dropped from monsters, or stolen from enemies. Some special materials can be simply found on the field. See this page for a list of materials and where to find them.

This system is somewhat similar to Castlevania: Dawn of Sorrow's Weapon Synthesis.