Mature grotworm
Mature grotworm is a level 98 members monster found in Asgarnia and Tirannwn, with 12,800 life points. It is weak to bolts (crossbows). It is the top source of Tiny plated rune salvage and Long bone.
“The final stage of a grotworm before its metamorphosis.”
Level 98MembersAttacks with magic
Updated . Stats and drops from the RuneScape Wiki's monster and drop data (CC BY-NC-SA 3.0), checked 2026-10-09. Wiki page. Item sprites © Jagex.
Combat stats
- Combat level
- 98
- Life points
- 12,800
- Combat XP per kill
- 640
- Max hit
- 1,400
- Armour
- 1,486
- Attack style
- Magic
- Weakness
- Bolts
- Aggressive
- No
- Poisonous
- No
Slayer
- Slayer level
- None needed
- Slayer XP per kill
- 343.6
- Task
- Grotworms
- Assigned by
- Raptor, Vannaka, Mazchna, Chaeldar, Sumona, Duradel, Kuradal, Morvran
Where
Asgarnia, Tirannwn
Ironman notes
- Counts as a Slayer task from Raptor, Vannaka, Mazchna, Chaeldar, Sumona, Duradel, Kuradal and Morvran (task: grotworms). Killing it on task earns Slayer XP and points.
- Weak to bolts (crossbows): bring that style for faster kills.
- A herb source: it drops 11 kinds of grimy herb, useful for Herblore without farming runs.
- Drops 14 kinds of seed, which keeps farm patches stocked.
- Drops crimson charm, gold charm, green charm and blue charms for Summoning pouches.
- Always drops Big bones: Prayer XP as you go.
- It can also roll the shared rare drop table (gems, key halves and bulk supplies); luck items improve those odds.
Best for
Best drop rate anywhere
Of every monster that drops these, this one gives the most per kill.
- Tiny plated rune salvage5/87
- Long bone1/400
Easiest monster for
The lowest-level monster that drops these, if the best one is out of reach.
Drops (55)
Most common first. “Best rate” and “#2/#3 rate” compare expected drops per kill with every other monster that drops the item. Rare drop table items are not repeated here.