How do Slayer task weights work?

Chance = task weight ÷ total weight of tasks you can still be assigned after blocks, Slayer level, combat level, and unlocks. Mortimer is different: he offers 2 (or 3) weighted choices without replacement.

How many Slayer tasks can I block?

Up to 7 per master: 50 quest points per slot (300 QP for six), plus a seventh with the elite Lumbridge & Draynor diary. Mortimer only has 2 slots. Each master has its own block list.

How do Slayer point milestones work?

The first four tasks of a streak give 0 points. After that you get the master’s base (Duradel 15, Konar 18 or 20 with elite Kourend, Nieve 12 or 15 with elite Western). Every 10th task is 5×, 50th 15×, 100th 25×, 250th 35×, 1000th 50×.

What is special about Mortimer?

Mortimer (Wyrmscraig, Fallen From Grace, combat 100 / Slayer 70) only assigns superiors, lets you pick 2 tasks (3 after 50 of his tasks), has 2 block slots, costs 100 to skip, cannot be Turael-skipped, and uses a separate streak. Points only come from his points modifier.

OSRS Slayer Calculator

Plan per-master blocks with impact deltas, compare Duradel/Nieve/Konar/Mortimer, run Turael point boosts, and import hiscores. Wiki weights including Mortimer.

Related: Skill calculator · Combat level · Pet odds

Slayer master

Slayer level

Combat level

Quest points

Task streak

Slayer points

Import hiscores

Best general task list. Requires Shilo Village. 99 Slayer cape skips the combat 100 req.

Elite Western (Nieve = 15 pts)Elite Kourend (Konar = 20 pts)Elite Lumbridge (7th block slot)Ignore combat-level task lockAssume all quests & area access

Reward-shop unlocks

On Duradel, blocking the 6 highest-weight tasks you didn't pin lifts do-task weight from 33.9% to 44.6%: Metal dragons, Hellhounds, Black dragons, Greater demons, Kalphites, Aviansie.

Do-task weight

33.9%

33 assignable tasks

Avg pts / task

27.0

next 50 incl. milestones

Net after skips

24.6

skip 30 pts · 16 in bank

Block slots

0/6

100 pts to set a block

Master comparison

Master	Do %	Skip %	Avg pts	Net	Blocks
Turael	0.0%	0.0%	0.0	0.0	0/6
Krystilia	6.8%	19.9%	45.0	39.0	0/6
Mazchna	0.0%	0.0%	10.8	10.8	0/6
Vannaka	11.4%	0.0%	14.4	14.4	0/6
Chaeldar	23.5%	1.2%	18.0	17.6	0/6
Konar quo Maten	30.3%	9.0%	32.4	29.7	0/6
Nieve	30.5%	9.9%	21.6	18.6	0/6
Duradel	33.9%	8.2%	27.0	24.6	0/6
Mortimer	17.5%	0.0%	0.0	0.0	0/2

Each master has its own block list (saved in this browser). Click a row to edit that master. Green = best do% / best net among masters you can use. Net = average points over 50 tasks minus expected skip cost.

Duradel blocks (0/6)

Highest-weight tasks you didn't pin as do. Prefer hellhounds / boss so they stay off the auto-list. Δ do is how much good-task weight rises if you block that row.

No blocks. Use the button or tap Block on a task.

Assignment odds

Metal dragons

Weight 14 · Δ do +2.1% · Combat 80+ · Dragon Slayer I

block

5.7%

Abyssal demons

Weight 12 · Slayer 85+ · Combat 85+ · Priest in Peril

4.9%

Boss

Weight 12 · Like a boss

4.9%

Hellhounds

Weight 10 · Δ do +1.4% · Combat 75+

block

4.1%

Lizardmen

Weight 10 · Reptile got ripped

4.1%

TzHaar

Weight 10 · Hot stuff

4.1%

Black dragons

Weight 9 · Δ do +1.3% · Combat 80+ · Dragon Slayer I

block

3.7%

Dagannoth

Weight 9 · Combat 75+ · Horror from the Deep

3.7%

Greater demons

Weight 9 · Δ do +1.3% · Combat 75+

block

3.7%

Kalphites

Weight 9 · Δ do +1.3% · Combat 15+

block

3.7%

Nechryael

Weight 9 · Slayer 80+ · Combat 85+ · Priest in Peril

3.7%

Aviansie

Weight 8 · Δ do +1.1% · Watch the birdie · God Wars Dungeon access

block

3.3%

Black demons

Weight 8 · Δ do +1.1% · Combat 80+

block

3.3%

Bloodveld

Weight 8 · Slayer 50+ · Combat 50+ · Priest in Peril

3.3%

Drakes

Weight 8 · Δ do +1.1% · Slayer 84+

block

3.3%

Gargoyles

Weight 8 · Slayer 75+ · Combat 80+ · Priest in Peril

3.3%

Suqah

Weight 8 · Δ do +1.1% · Combat 85+ · Lunar Diplomacy

block

3.3%

Wyrms

Weight 8 · Δ do +1.1% · Slayer 62+

block

3.3%

Aberrant spectres

Weight 7 · Δ do +1.0% · Slayer 60+ · Combat 65+ · Priest in Peril

block

2.9%

Fire giants

Weight 7 · Δ do +1.0% · Combat 65+

block

2.9%

Fossil Island Wyverns

Weight 7 · Δ do +1.0% · Slayer 66+ · Combat 60+ · Stop the Wyvern · Bone Voyage · Elemental Workshop I

block

2.9%

Skeletal Wyverns

Weight 7 · Δ do +1.0% · Slayer 72+ · Combat 70+ · Elemental Workshop I

block

2.9%

Spiritual creatures

Weight 7 · Δ do +1.0% · Slayer 63+ · Combat 60+ · Death Plateau · God Wars Dungeon access

block

2.9%

Trolls

Weight 6 · Δ do +0.9% · Combat 60+

2.4%

Ankou

Weight 5 · Δ do +0.7% · Combat 40+

2.0%

Dust devils

Weight 5 · Slayer 65+ · Combat 70+ · Desert Treasure I

2.0%

Frost dragons

Weight 5 · Δ do +0.7%

2.0%

Blue dragons

Weight 4 · Δ do +0.6% · Combat 65+ · Dragon Slayer I

skip

1.6%

Cave horrors

Weight 4 · Δ do +0.6% · Slayer 58+ · Combat 85+ · Cabin Fever

skip

1.6%

Elves

Weight 4 · Δ do +0.6% · Combat 70+ · Regicide

skip

1.6%

Kurask

Weight 4 · Δ do +0.6% · Slayer 70+ · Combat 65+

skip

1.6%

Mutated Zygomites

Weight 2 · Δ do +0.3% · Slayer 57+ · Combat 60+ · Lost City

skip

0.8%

Waterfiends

Weight 2 · Δ do +0.3% · Combat 75+ · Ancient Cavern

skip

0.8%

10 locked (level, unlock, or quest)

AquanitesUnlock: Lured In
AraxytesSlayer 92+
BasilisksUnlock: Basilocked
Cave krakenSlayer 87+
Dark beastsSlayer 90+
GryphonsUnlock: Wings Spread
Red dragonsUnlock: Seeing red
Smoke devilsSlayer 93+
VampyresUnlock: Unlock vampyres
Warped CreaturesUnlock: Warped Reality

Turael point boost

Completing Turael/Spria tasks counts for streak but pays 0. Asking Turael to skip another master's task resets the normal streak. Krystilia and Mortimer keep separate streaks — this boost is for the Duradel/Nieve/Konar streak only.

Hit streak	Turael first	Then Konar quo Maten
60	9 tasks	90 pts
100	49 tasks	450 pts
250	199 tasks	630 pts
1000	949 tasks	900 pts

First 4 streak tasks give 0 points. Then 15 each on Duradel, 5× every 10th, 15× every 50th, 25× every 100th. Next 10th is streak 60 (10 left) for 75 pts.

Related: Skill calculator · Combat level · Pet odds

Why this is not just a RuneLite overlay

Plugins track the task you already have. This page is for planning: block impact (Δ do if you lock Metal dragons), per-master lists (7 slots, 2 on Mortimer), hiscores-filled skill/quest filters, Turael boost payouts on the next 10th/50th/100th, and Mortimer's exact 2-of-N offer odds. Share a link with your blocks when you're done.

Blocks, skips, and points

Block high-weight tasks you never want (Metal dragons is weight 14 on Duradel). Skip low-weight annoyances (30 points, 100 on Mortimer). Streak milestones pay more than grinding Konar every task — Turael for 9, then a 10th from Konar, is the usual point boost. Krystilia and Mortimer keep separate streaks.

All Slayer masters

Turael / Aya / Spria — Burthorpe / Draynor, 0 pts/task, skip 30 · 24 tasks
Krystilia — Edgeville (Wilderness), 25 pts/task, skip 30 · 37 tasks
Mazchna / Achtryn — Canifis, combat 20+, 6 pts/task, skip 30 · 30 tasks
Vannaka — Edgeville Dungeon, combat 40+, 8 pts/task, skip 30 · 46 tasks
Chaeldar — Zanaris, combat 70+, 10 pts/task, skip 30 · 40 tasks
Konar quo Maten — Mount Karuulm, combat 75+, 18 pts/task, skip 30 · 39 tasks
Nieve / Steve — Tree Gnome Stronghold, combat 85+, 12 pts/task, skip 30 · 46 tasks
Duradel / Kuradal — Shilo Village, combat 100+, Slayer 50+, 15 pts/task, skip 30 · 43 tasks
Mortimer — Wyrmscraig Cavern, combat 100+, Slayer 70+, 0 pts/task, skip 100 · 29 tasks

FAQ

How do task weights work?: Chance = weight ÷ remaining pool. Mortimer instead draws 2 or 3 tasks and you pick.
How many blocks?: 50 QP per slot (max 6), +1 with elite Lumbridge & Draynor. Mortimer: 2. Lists are per master.
Duradel vs Nieve vs Konar vs Mortimer?: Duradel for task quality. Nieve before combat 100 (15 pts with elite Western). Konar for points and hydras (locations + brimstone keys). Mortimer for superiors and choosing the task — expensive skips, few blocks.

Weights from the OSRS Wiki MasterTables (OSRS Wiki Module:SlayerConsts/MasterTables). Block/skip costs from the individual master pages. Re-run node scripts/parse-slayer-tables.mjs after wiki updates.