Mortimer

This article has a strategy guide. All information on mechanics and strategy will be on this page.

Mortimer
Released								29 July 2026 (Update)
Members								Yes
Race								Skeleton
Location								Wyrmscraig Cavern
Shop								Slayer Equipment, Slayer Rewards
Gender								Male
Options								Talk-to, Assignment, Trade, Rewards
Examine								He looks dangerous, and boney!
Map
Advanced data
NPC ID								16175,16294
Link								MOID

Mortimer is the highest level Slayer Master, found in Wyrmscraig Cavern. To be assigned a Slayer task by Mortimer, the player must either have a combat level of 100 and a Slayer level of 70, or any combat level if the player has achieved 99 Slayer and shows him the Slayer cape. In addition, the player must have partially completed the Fallen From Grace quest.

Mortimer has three unique traits that separate him from other Slayer Masters. The first is that, rather than granting Slayer points by default, Mortimer has a unique system of unlockable modifiers called "Mortifiers" that affect his tasks. The second is that he only assigns tasks with a superior variant, making him ideal for players seeking drops from the superior slayer table such as the imbued heart and eternal gem. The third is that he offers a choice of tasks when getting an assignment from him. Because of this, skipping a task from Mortimer is significantly more expensive, costing 100 slayer points rather than the usual 30, and he only offers two block slots which cost 120 slayer points each. Additionally, Mortimer's tasks cannot be skipped by receiving a replacement assignment from Turael.

As with Krystilia, tasks stored from Mortimer are shared alongside the rest of the Slayer Masters. The player should take note of this if they have a temporarily undesirable task from Mortimer and another undesirable task from another Slayer Master, as they will be forced to complete one of the two in order to free up storage.

Mortimer is the only Slayer Master who can assign venators directly, and shares several tasks that used to be exclusive to only a single other Slayer Master, namely hydras from Konar, infernal mages from Vannaka, and rockslugs from Mazchna. While Mortimer is intended for superior slayer monsters, players can complete the task at their corresponding boss if applicable.

Unlike other Slayer Masters, Mortimer offers a choice of two potential tasks when approached for an assignment. This increases to three options after the player has completed 50 Slayer tasks with him. Each task can only be offered once per prompt. For example, a player cannot be given a choice of tasks in which two or more options are crawling hands. However, players can get the same monster back-to-back, even without the slayer cape effect going off.

Similarly to Krystilia, Mortimer's task streaks are counted separately from that of normal tasks. If Mortimer has offered you a task, you cannot get a task from another Slayer Master. If you attempt to do so, you will receive the message, "Hmm... It appears as though Mortimer has provided you with a task choice, you must go to them in order to pick."

Alongside the option to pick a task, each of Mortimer's tasks have a modifier to potentially incentivise one task over another. A modifier can be applied to one or more offered tasks at a time. For example, two tasks might offer more Slayer experience while the third offers a quantity modifier.

The Slayer cape, if it activates on one of Mortimer's tasks, will retain the assigned task and modifier. This can be used to retain a preferred task and modifier combo, e.g hydras with a 150% drop rate increase for superior slayer drops.

If the player is unsure of what modifier the task has, they may check their enchanted gem, slayer ring (or eternal slayer ring) for the overall benefit. However if the player logs out, they will no longer be able to check the task's modifier. If looking for the exact modifier for clue scrolls, slayer experience or superior drop rate increase, they must head to a Slayer Master.

Below is the list of tasks Mortimer can assign along with the proposed minimum and maximum values that can roll for that creature's modifiers. The modifier values increase in increments of five, for example: 25%, 30%, 35% and so on.

Monster	Amount	Extended amount	Weight	Unlock Requirement	Quantity Modifier	Points Modifier	Clue Scroll Modifier	Clues Dropped[note]	XP% Modifier	Superior Unique% Modifier
Crawling hands	35-50	N/A	10	5 , completion of Priest in Peril	-15-30	5-15	N/A	N/A	25%-100%	50%-100%
Cave crawlers	35-50	N/A	10	10 , 10	-15-30	5-15	N/A	N/A	25%-100%	50%-100%
Banshees	35-50	N/A	10	15 , 20 , completion of Priest in Peril	-15-30	5-15	75%-150%	Easy clues (Slayer Tower Banshees only) Hard clues (Twisted Banshees only)	25%-100%	50%-100%
Rockslugs	35-50	N/A	10	20 , 20	-15-30	5-15	N/A	N/A	25%-100%	50%-100%
Cockatrice	35-50	N/A	10	25 , 25 , 20	-15-30	5-15	75%-150%	Medium clues	25%-100%	50%-100%
Pyrefiends	35-50	N/A	10	30 , 25	-15-30	5-15	75%-150%	Medium clues	25%-100%	50%-100%
Basilisks	40-60	200-250	10	40 , 40 , 20	50-100	25-40	75%-150%	Hard clues (Basilisk knights only)	35%-75%	200%-300%
Infernal mages	35-50	N/A	10	45 , 40 , completion of Priest in Peril	-15-30	5-15	N/A	N/A	25%-100%	50%-100%
Bloodvelds	120-180	200-250	8	50 , 50 , completion of Priest in Peril	50-100	10-15	35%-75%	Hard clues	5%-15%	100%-150%
Gryphons	80-120	160-200	10	51 , 45 , completion of Troubled Tortugans	50-100	10-25	75%-150%	Hard clues	20%-50%	100%-150%
Jellies	80-120	N/A	10	52 , 57	50-100	10-15	35%-75%	Hard clues	10%-25%	100%-150%
Custodian stalkers	80-120	200-250	8	54 , completion of Shadows of Custodia	50-100	10-15	N/A	N/A	10%-25%	100%-150%
Turoth	80-120	N/A	10	55 , 60	30-80	15-30	75%-150%	Hard clues	35%-75%	200%-300%
Warped creatures	80-120	N/A	10	56 , completion of The Path of Glouphrie	50-100	15-30	75%-150%	Hard clues	35%-75%	200%-300%
Cave horrors	80-120	200-250	10	58 , 85 , completion of Cabin Fever	30-80	15-30	75%-150%	Hard clues	35%-75%	200%-300%
Aberrant spectres	80-120	200-250	10	60 , 65 , completion of Priest in Peril	30-80	15-30	75%-150%	Hard clues	35%-75%	200%-300%
Wyrms	80-120	200-250	10	62	50-100	25-40	75%-150%	Hard clues (Wyrms, Strykewyrms only)	35%-75%	200%-300%
Dust devils	120-180	200-250	8	65 , 70 , partial completion of Desert Treasure I	50-150	10-15	N/A	N/A	10%-20%	100%-150%
Kurask	40-60	N/A	10	70 , 65	30-80	25-40	75%-150%	Hard clues	35%-75%	200%-300%
Venators	120-180	N/A	10	74 , 60 , completion of The Blood Moon Rises	50-100	10-25	75%-150%	Elite clues	35%-75%	200%-300%
Gargoyles	120-180	200-250	10	75 , 80 , completion of Priest in Peril	50-100	15-30	75%-150%	Hard clues	35%-75%	200%-300%
Aquanites	40-60	150-200	10	78 , 73	50-100	25-40	75%-150%	Hard clues	35%-75%	200%-300%
Nechryael	150-200	200-250	8	80 , 85 , completion of Priest in Peril	50-100	10-20	35%-75%	Hard clues	15%-30%	70%-120%
Drakes	40-60	N/A	10	84	30-80	25-40	75%-150%	Hard clues	25%-75%	75%-150%
Abyssal demons	120-180	200-250	8	85 , 85 , completion of Priest in Peril or Fairytale II - Cure a Queen [1]	50-100	10-25	35%-75%	Hard clues Elite clues	10%-25%	30%-60%
Dark beasts	40-60	110-135	10	90 , 90 , started Mourning's End Part II	30-80	10-25	75%-150%	Hard clues Elite clues	35%-75%	200%-300%
Araxytes	120-180	200-250	8	92 , Completion of Priest in Peril	50-100	10-20	35%-75%	Hard clues	5%-15%	10%-25%
Smoke devils	80-120	N/A	8	93 , 85	50-100	10-20	35%-75%	Hard clues Elite clues	5%-15%	10%-25%
Hydras	150-200	N/A	10	95	50-100	15-30	75%-150%	Hard clues Elite clues	10%-30%	75%-150%
Total task weight			276

• 
  Mortimer as featured in ScreteMonge's submission to the Player Designed Island Competition.
• 
  Mortimer concept art by Mod Jerv.

As with many aspects of Wyrmscraig, Mortimer was designed by the player ScreteMonge as part of the Player Designed Island Competition. Mortimer would have allowed players to choose their next Slayer task from another Slayer Master for a "hefty cost" of Slayer reward points, which was intended to bring traditional Slayer task-streaking in line with Turael skipping. The ability to buy desired Slayer tasks was scrapped by Jagex due to it being too difficult to balance, along with feeling that it would only reinforce Turael skipping instead of offering an alternative.^[2]

Jagex's initial proposal required the following amount of Mortimer task completions to unlock each modifier. They were roughly halved due to player feedback that the amount of time required to reach 100 Mortimer tasks would outweigh his benefits.^[3]

• 0 tasks - Slayer Point Modifier
• 0 tasks - Task Quantity Modifier
• 25 tasks - Clue Scroll Modifier
• 50 tasks - Slayer XP Modifier
• 75 tasks - Superior Drop Rate Modifier
• 100 tasks - Third Task Choice

• "Mortimer" is an English name derived from the Old French morte, meaning dead, and mer, meaning sea. Mortimer's designer did not intend for the name to be a pun, though they did realise it could be interpreted as one shortly after conceiving the character.^[4]
• Mortimer's cloak has the symbol of Saradomin on it, implying that he is a Saradominist.
  • He also proclaims himself to be the oldest Slayer Master in Gielinor.^[5] He is at least a few centuries old, as he says that's how long ago he coined the term "mortifiers" for his modifiers.^[6]
  • It is possible that Mortimer could be thousands of years old, as Saradominists led by Elessia first settled on Wyrmscraig during the Third Age.

• Update:Wyrmscraig - Activities & Lock In Poll
• Update:Meet Mortimer: Your Newest Slayer Master