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.

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Could this be updated to always show the monster names? It would lessen the need to look at the wiki constantly. : r/runescape

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