On Drop Rate
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About On Drop Rate

On Drop Rate helps you check roughly how long you'd need to grind for an item, and whether you're actually dry right now, or just feeling like it.

We're passionate OSRS players, grinding since the game's 2013 release across multiple accounts and every seasonal game mode along the way.

This vibe-coded project is built and maintained by us.

Greetings from Team On Drop Rate.

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Nightmare / Phosani's calculation

Each unique's listed rarity (e.g. 1/750 for the Inquisitor's mace) is the item's real per-kill chance, taken live from the wiki's drop table. On Phosani's Nightmare (solo) every roll belongs to you, so that rarity is used directly.

On the regular Nightmare (5-man), that same per-kill chance is for the whole party — when it hits, only one random party member (weighted by damage) actually receives the item. So your personal expected kills to land it is the listed rarity × 5 (e.g. 750 × 5 = 3,750 kills), which is what the time estimate on this page uses.

Is PNM actually faster for uniques?

Yes — Phosani's Nightmare (PNM) is substantially better for farming uniques, even compared with a regular 5-man Nightmare team. The important distinction is uniques per player, not just the boss's raw drop table.

Bottom line for the unique grind: PNM >>> 5-man Nightmare. A 5-man team is mainly attractive because it's chill, social and easier — not because it's efficient for your own Inquisitor/orb.

← All bosses
Nightmare (5-man)
Nightmare (5-man)
Boss version
Phosani's Nightmare Nightmare (5-man)
Kills per hour modifier
kills/hour

The Inquisitor's mace takes about
340 hours and 55 minutes to obtain if you are exactly on droprate.

Assumes a 5-man team at 12 kills/hour — only 1 random party member receives a drop when it rolls, so your personal expected kills is 5x the listed drop rate

Expected kills
3,750
Expected kills on drop rate
Expected time to obtain
340h 55m
at 11 kills/hour (average)

Loot from 3,750 kills

Loading prices…
Item Quantity Price (ea) Total value
Total loot value—