Slayer Codex - The RuneScape Wiki

The Slayer Codex is the book used to record the souls of Slayer monsters that the player has captured. It is obtained from Faiza after achieving level 99 Slayer. The Codex is updated when a new creature's soul is captured in an ushabti and placed in the Chest of Souls, or when it is added to the player's personal Slayer Dungeon. Removing a monster from the slayer dungeon will not remove the soul from the Codex.

Slayer - The RuneScape Wiki

TzKal-Zuk - The RuneScape Wiki

Made a Slayer Codex Tracking / Progress Sheet : r/runescape

Slayer Codex Creatures - RuneScape Guide - RuneHQ

Fremennik Slayer Dungeon - The RuneScape Wiki

Slayer - The RuneScape Wiki

Corporeal Beast, Old School RuneScape Wiki

Fremennik Slayer Dungeon - The RuneScape Wiki

Zanaris - OSRS Wiki

Anachronia base camp - The RuneScape Wiki

Anachronia Dinosaur Farm - The RuneScape Wiki