Buy RS3 Undead Slayer ability codex

Description

The Undead Slayer ability codex is an item in RuneScape 3. When you consume it, you unlock the Undead Slayer ability. This ability boosts your damage against undead monsters by 15% for 10 seconds.

The extra damage also works on bleed abilities like Dismember and Combust. That makes it a strong pick for fights against undead bosses and Slayer tasks. The ability has no upkeep cost. It replaced the old undead slayer sigil, which was removed from the game on 19 August 2019.

Making this codex yourself takes a lot of work. You need level 88 Invention and level 80 Crafting. First, you must buy the blueprint from the Elite Dungeon Reward Shop for 100,000 Dungeoneering tokens. Then you must discover it at an Inventor's workbench. Crafting it uses 100 Black stone hearts, 2 Onyxes, and 60 Oceanic components. Buying the codex lets you skip all of that.

The codex is tradeable and noteable. It weighs almost nothing and is always kept outside a dangerous area on death. If you fight undead often, this unlock gives you a clear damage boost with no ongoing cost.