L_Ender's Cataclysm Wiki & Guide

Weapon fusion combines two powerful items into a single stronger one. For example, an Infernal Forge fused with Astrape makes Brontes, and an Ignitium Chestplate fused with an Elytra makes the Ignitium Elytra Chestplate, keeping flight with heavy chest armor.

Ignitium armor is a smithing upgrade: apply an Ignitium Ingot and the mod's smithing template to each netherite piece to make the Ignitium Helmet, Chestplate, Leggings and Boots.

The Ancient Factory is the rarest, generating about once per 112x112 chunk region. The Sunken City (100x100) and the Acropolis, Burning Arena, Cursed Pyramid and Frosted Prison (80x80) are also widely spaced.

Azure Seastone is crafted by combining stone with Lacrima — eight Stone and one Lacrima yield eight Azure Seastone, which anchors a large building set of bricks, pillars, slabs and stairs.

The Monstrous Helm is made by upgrading a Netherite Helmet with a Monstrous Horn, a boss drop, through smithing.

Each boss lives in a dungeon, and almost every Cataclysm structure overrides monster spawning — so finding a structure means finding a fight. The great dungeons sit tens of thousands of blocks apart, so expect long expeditions.