TL;DR: The Codex of Giant is the scroll you spend to learn 3rd class transfer skills at level 76+. It drops from monsters in Catacombs and Necropolises, with Catacomb of Dark Omens offering the best rate. Each skill costs several codexes, so start stockpiling around level 72-74.

Overview

The Codex of Giant is a scroll used to learn 3rd class transfer skills (level 76+). You get it as a drop in Catacombs and Necropolises, or buy it from other players. Every 3rd-class skill costs several codexes, making it one of the key materials for completing your 3rd class transfer.

Where to Farm

The Codex of Giant drops from monsters in Catacombs and Necropolises. The mobs there hit hard, so the fastest way to farm is in a party of 3-5 players. The winning side of Seven Signs also gets bonus access to the Catacombs, opening up extra farm.

Farming SpotTypeNotes
Catacomb of Dark OmensCatacombHighest drop rate โ€” the go-to spot for stockpiling codexes.
Necropolis of SacrificeNecropolisSolid alternative with steady drops.
Catacomb of the HereticCatacombReliable backup when other spots are crowded.

How Many You Need

Each 3rd-class skill costs between 5 and 15 codexes to learn, depending on the skill's level. Fully learning every skill on a single character takes roughly 80-120 codexes. On low-rate servers this can mean several weeks of farming, so it pays to plan ahead.

GoalCodexes Needed
One 3rd-class skill5-15
All skills on one character~80-120

Start collecting codexes early โ€” around level 72-74 โ€” so you have a healthy stockpile ready by the time you hit 76 and complete your 3rd class transfer.