How does TOA purple chance work?

You get a 1% unique chance for every (10,500 − 20 × scaled raid level) contribution points, capped at 55%. Raid levels above 310 use a compressed scaled level. Your deaths remove 20% of your reward points each (floor 1,000).

How do CoX points convert to purple chance?

For every 8,676 team points you gain 1% chance at a unique, capped at 65.7% (570,000 points). Extra points roll for additional uniques. If a purple hits, the recipient is chosen proportional to personal points. Deaths cost 40% of your personal points. Olmlet is 1/53 when you receive a unique.

What raid level is Expert mode at Tombs of Amascut?

Entry is 0–149, Normal is 150–299, and Expert is 300–600. Ending at 300+ is required for Expert combat achievements (after timer failures that reduce level).

OSRS Raid Calculator

Plan Tombs of Amascut invocations and check Chambers of Xeric purple odds from real points — using the same formulas as the OSRS Wiki calculators.

Raid level

300Expert

Enemy scaling

HP / Def / Acc +120% · Damage +120%

Uniques at this level

FangLBWardMaskBodyChapsShadow

Attempts · one only

Time Limit · one only

Helpful Spirit · one only

Paths

Path Level · one only

Prayer

Restoration

Akkha

Kephri

Zebak

Ba-Ba

The Wardens

Run setup

Team size

Your deaths

Team points override

Timer failed (−40 raid level)

Loot odds

Purple chance

4.33%

Pet chance0.14%

Points used19,481

Pts / 1% purple4,500

Unique odds (your share)

Tumeken's shadow· 4.2% if purple0.180%

Masori mask· 8.3% if purple0.361%

Masori body· 8.3% if purple0.361%

Masori chaps· 8.3% if purple0.361%

Elidinis' ward· 12.5% if purple0.541%

Osmumten's fang· 29.2% if purple1.263%

Lightbearer· 29.2% if purple1.263%

· Point estimate assumes a clean raid (wiki module averages). Override with real end-of-raid contribution when you can.
· Your deaths remove 20% of your reward points each (floor 1,000) — teammates are unchanged.
· Only one purple per raid; recipient is weighted by personal contribution.
· Scaled raid level for purple math: 300 (compression above 310).

Team points

120,000

Your share

33.3% · 40,000 personal

Any purple

13.83%

Points

Team points (total)

Your personal points

Your deaths (before final total)

Death = −40% personal points. Set deaths to 0 if you already entered post-raid totals. Challenge Mode uses the same unique math — just enter CM points.

Pts per 1%8,676

Expected purples (team)0.138

You get a unique4.61%

Olmlet (expected)0.087%

Rolls & uniques

Roll 1 (120,000 pts)13.83%

Your chance per unique

Dexterous prayer scroll 20/69 · 29.0% if purple1.336%

Arcane prayer scroll 20/69 · 29.0% if purple1.336%

Twisted buckler 4/69 · 5.8% if purple0.267%

Dragon hunter crossbow 4/69 · 5.8% if purple0.267%

Dinh's bulwark 3/69 · 4.3% if purple0.200%

Ancestral hat 3/69 · 4.3% if purple0.200%

Ancestral robe top 3/69 · 4.3% if purple0.200%

Ancestral robe bottom 3/69 · 4.3% if purple0.200%

Dragon claws 3/69 · 4.3% if purple0.200%

Elder maul 2/69 · 2.9% if purple0.134%

Kodai insignia 2/69 · 2.9% if purple0.134%

Twisted bow 2/69 · 2.9% if purple0.134%

· For every 8,676 team points you get +1% purple chance, capped at 65.7% (570,000 points) per roll.
· Points past 570k roll for additional uniques (up to 6).
· If a purple is rolled, the recipient is chosen proportional to personal points.
· Dying costs 40% of your personal points at the time of death — set deaths to 0 if totals are already post-raid.
· Olmlet is 1/53 when you personally receive a broadcasted unique.
· Challenge Mode uses the same unique math — enter the points you actually finished with.

Related: Drop Rate Calculator · GE Tracker

TOA invocations

Each invocation adds raid level. Higher level scales NPC stats and improves unique chance, but fang/lightbearer weights drop after 300 while shadow/masori/ward weights improve. Prerequisites (Insanity chain, Akkha head kids) are enforced like in-game. Use presets as starting points, then toggle for your team's comfort.

CoX points

Team points drive purple rolls; your personal share decides who gets the item. Enter the totals from your raid end screen / RuneLite plugin. Challenge Mode uses the same unique math — only the points you earned change. Ancestral pieces are 3/69 each per the Ancient chest table.

Sources

Formulas from Chest (Tombs of Amascut), Module:Tombs of Amascut loot, and Ancient chest.

OSRS Raid Calculator

TOA invocations

CoX points

Sources

Related Tools

Guide

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