About ezSlayer

ezSlayer is a fan-made, non-commercial companion for Old School RuneScape's Slayer skill: pick your master, pick your task, and get the whole picture in one tab — assignment odds, the full loot table with the probability of each drop for your task size, where to go, and what will kill you if you're not paying attention.

Methodology

Every game number on this site is ingested from the OSRS Wiki at build time. Nothing is hand-entered: assignment tables (weights, quantities, unlocks) come from each Slayer Master's wiki page, drop tables from each monster's rendered drop tables — including computed sub-tables like herbs, the rare drop table and catacombs tertiaries — combat stats from monster infoboxes, and spawn locations (with exact map coordinates) from the wiki's location data. Most published rates trace back to the wiki's Drop Rate Project and Jagex-confirmed figures.

Where a rate isn't published, the site shows "—" rather than a guess. Where our parser can't read something, the page says so. The one deliberately human layer — difficulty ratings and "watch out" notes — is kept in a separate editorial file and labelled as such on every page.

Odds are simple independent-trial probability: the chance of at least one drop in n kills at rate 1/r is 1 − (1 − 1/r)ⁿ. Real drops are (mostly) independent rolls, so past dryness changes nothing — sorry.

Currently indexed: 10 masters, 119 tasks, 116 monsters, 6,372 drop-table rows. Last synced 2026-08-06; data refreshes weekly.

Attribution & licences

Game data © the OSRS Wiki community, used under CC BY-NC-SA 3.0. This site is non-commercial and carries no ads, consistent with that licence.
Teleport landing coordinates from the RuneLite shortest-path plugin transport data (BSD-2-Clause), matched to spawn locations by distance at build time.
Old School RuneScape and all game imagery (item sprites, NPC art, the world map) are © Jagex Ltd, used in line with the Jagex fan content policy. Map tiles via the OSRS Wiki maps project and Explv's map.
ezSlayer is not affiliated with or endorsed by Jagex.

Privacy

There is no backend, no accounts, no analytics and no cookies. Everything you configure lives in the URL of the page you're on — share the link and the other person sees exactly what you see.

Corrections

Spotted a wrong number? It almost certainly means the wiki changed or our parser misread something — the wiki page linked in each task's footer is the source of truth. Data re-syncs weekly.