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Mature grotworm

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This article is about level 98 Grotworms. For other types of Grotworms, see Grotworm (disambiguation).
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Mature grotworms are monsters that can be found on the bottom level of the Grotworm Lair. They have slow, but accurate and hard-hitting magic and melee attacks. However, magic attacks are only used on players outside of melee range, similar to monsters such as metal dragons and cockroach soldiers. It is possible to safespot them using the pillars if you stand far enough back from them. Lower-level players are recommended to bring high healing food such as monkfish or sharks. Ranged/magic would require Protect from Magic/Deflect Magic if using safe spots. The magic attack has a short range, so flashing your prayer when out of its range can help conserve prayer points. Despite their ranged weakness, a player with 70+ melee stats should have little trouble killing them efficiently, even without the use of prayer.

Using high level ranged gear such as Armadyl and using a bunyip will reduce the need for prayer potions/flasks. The occasional Shark drops will reduce the need for food, and ranged gear will mean little damage from the mature grotworms' magic attack while ranging.

If a player tries to set up a cannon within the Grotworm Lair, they will receive a message saying: "The damp air would prevent your cannon operating." This does not prevent hand cannons from working, however.

Some players may find it useful to bring runes to cast High Level Alchemy on the items dropped by the grotworms, as adamant and rune equipment are common drops. The profit of using this spell on some of these items is greater than banking and selling them.


100% dropEdit

Item Quantity Rarity GE market price
Big bonesBig bones1Always368


Charm drop numbers
No charmGold charmGreen charmCrimson charmBlue charm
Represents a 90% confidence range.
Based on a sample of 10,573 kills.
1 charm is dropped at a time.
Add data to the log
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Weapons and ArmourEdit

Item Quantity Rarity GE market price
Adamant chainbodyAdamant chainbody1Common2,275
Adamant sq shieldAdamant sq shield1Common1,643
Rune daggerRune dagger1Common4,201
Rune helmRune helm1Common10,762
Rune maceRune mace1Common7,934
Rune longswordRune longsword1Uncommon18,334
Royal capeRoyal cape1Rare994


Item Quantity Rarity GE market price
Grimy guamGrimy guam1Uncommon239
Grimy marrentillGrimy marrentill1Uncommon207
Grimy tarrominGrimy tarromin1Uncommon53
Grimy harralanderGrimy harralander1Uncommon148
Grimy ranarrGrimy ranarr1Rare2,216
Grimy iritGrimy irit1Rare1,678
Grimy avantoeGrimy avantoe1Rare3,538
Grimy kwuarmGrimy kwuarm1Rare4,957
Grimy cadantineGrimy cadantine1Very rare4,935
Grimy lantadymeGrimy lantadyme1Very rare4,716
Grimy dwarf weedGrimy dwarf weed1Very rare4,827


Item Quantity Rarity GE market price
Fellstalk seed 5Fellstalk seed[1]2Common664
Belladonna seed 5Belladonna seed1Rare275
Cactus seed 5Cactus seed1Rare124
Poison ivy seed 5Poison ivy seed1Rare31
Herb seed 5Toadflax seed1Uncommon410
Herb seed 5Irit seed1Rare198
Herb seed 5Avantoe seed1Rare320
Herb seed 5Kwuarm seed1Rare1,001
Herb seed 5Snapdragon seed1Very rare283
Herb seed 5Cadantine seed1Very rare1,079
Herb seed 5Lantadyme seed1Very rare3,326
Herb seed 5Dwarf weed seed1Very rare4,529
Herb seed 5Torstol seed1Very rare2,939
  1. ^ No anagogic ort is dropped along this drop.

Raw MaterialsEdit

Item Quantity Rarity GE market price
FlaxFlax50–100 (noted)Common1,000–2,000
Runite oreRunite ore1Common10,113
Adamantite oreAdamantite ore3 (noted)Common4,128
Royal dragonhideRoyal dragonhide1Uncommon5,005


Item Quantity Rarity GE market price
Coins 1000Coins5,000Common5,000
Saradomin brew (2)Saradomin brew (2)1Common5,013
Long boneLong bone1RareNot sold
Curved boneCurved bone1RareNot sold
Clue scroll (hard)Clue scroll (hard)1RareNot sold
Spirit sapphireSpirit sapphire1RareNot sold
Spirit emeraldSpirit emerald1RareNot sold
Spirit rubySpirit ruby1RareNot sold
Court summonsCourt summons1Very rareNot sold
Starved ancient effigyStarved ancient effigy1Very rareNot sold

Rare drop table dropsEdit

This monster has access to the rare drop table.
The ring of wealth is not required to access the table.
Show/hide rare drop table
Item Quantity Rarity GE market price
Coins 1000Coins250–500; 3,000Common250–3,000
Uncut sapphireUncut sapphire1Common806
Uncut emeraldUncut emerald1Common1,351
Uncut rubyUncut ruby1Common2,235
Uncut diamondUncut diamond1Common3,841
Uncut diamondUncut diamond45–55 (noted)Rare172,845–211,255
Loop half of a keyLoop half of a key1Uncommon17,689
Tooth half of a keyTooth half of a key1Uncommon32,654
Uncut dragonstoneUncut dragonstone1Uncommon11,934
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare537,030–656,370
Dragon longswordDragon longsword1Common57,720
Dragon spearDragon spear1Uncommon36,402
BattlestaffBattlestaff180–220 (noted)Uncommon1,314,000–1,606,000
Rune javelinRune javelin5Rare905
Rune platebodyRune platebody1Uncommon37,980
Rune platebodyRune platebody15–25 (noted)Rare569,700–949,500
Shield left halfShield left half1Uncommon64,942
Dragon helmDragon helm1Uncommon59,145
Rune arrowheads 5Rune arrowheads113–137Common22,035–26,715
Onyx bolts 5Onyx bolts135–165Rare1,111,860–1,358,940
Vecna skullVecna skull1Uncommon52,293
Chaos talismanChaos talisman1Uncommon814
Nature talismanNature talisman1Uncommon738
Water talismanWater talisman65–82 (noted)Rare523,835–660,838
Earth talismanEarth talisman65–82 (noted)Rare131,105–165,394
Fire talismanFire talisman25–35 (noted)Rare41,775–58,485
Raw lobsterRaw lobster135–165 (noted)Uncommon22,950–28,050
Raw sharkRaw shark225–275 (noted)Uncommon225,450–275,550
Big bonesBig bones79–90 (noted)Uncommon29,072–33,120
Dragon bonesDragon bones180–220 (noted)Uncommon503,100–614,900
CoalCoal200–1,100 (noted)Uncommon82,400–453,200
Gold oreGold ore90–110 (noted)Common11,610–14,190
Adamantite oreAdamantite ore180–220 (noted)Uncommon247,680–302,720
Adamant barAdamant bar15 (noted)Common40,455
Adamant barAdamant bar135–165 (noted)Rare364,095–445,005
Runite oreRunite ore90–110 (noted)Rare910,170–1,112,430
Rune barRune bar3 (noted)Common42,942
Rune barRune bar45–55 (noted)Rare644,130–787,270
Grimy torstolGrimy torstol90–110 (noted)Uncommon407,430–497,970
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon292,860–357,940
Super restore (4)Super restore (4)45–55 (noted)Uncommon185,085–226,215
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon128,925–157,575
Herb seed 5Lantadyme seed14–16Uncommon46,564–53,216
Herb seed 5Dwarf weed seed14–16Uncommon63,406–72,464
Magic seed 5Magic seed4Uncommon405,664
Palm tree seed 5Palm tree seed10Rare1,429,570
FlaxFlax450–550 (noted)Common9,000–11,000
Molten glassMolten glass45–55 (noted)Common5,760–7,040
Soft claySoft clay450–550 (noted)Uncommon154,350–188,650
Yew logsYew logs68–82Uncommon14,212–17,138
Yew logsYew logs675–825 (noted)Rare141,075–172,425
Teak plankTeak plank45–55 (noted)Uncommon27,765–33,935
Mahogany plankMahogany plank270–330 (noted)Rare554,580–677,820
Brawling gloves (Melee)Brawling gloves (Melee)1RareNot sold
Brawling gloves (Magic)Brawling gloves (Magic)1RareNot sold
Brawling gloves (Ranged)Brawling gloves (Ranged)1RareNot sold
Brawling gloves (Agility)Brawling gloves (Agility)1RareNot sold
Brawling gloves (Cooking)Brawling gloves (Cooking)1RareNot sold
Brawling gloves (FM)Brawling gloves (FM)1RareNot sold
Brawling gloves (Fishing)Brawling gloves (Fishing)1RareNot sold
Brawling gloves (Hunter)Brawling gloves (Hunter)1RareNot sold
Brawling gloves (Mining)Brawling gloves (Mining)1RareNot sold
Brawling gloves (Prayer)Brawling gloves (Prayer)1RareNot sold
Brawling gloves (Smithing)Brawling gloves (Smithing)1RareNot sold
Brawling gloves (Thieving)Brawling gloves (Thieving)1RareNot sold
Brawling gloves (WC)Brawling gloves (WC)1RareNot sold
Crystal triskelion fragment 1Crystal triskelion fragment 11Very rareNot sold
Crystal triskelion fragment 2Crystal triskelion fragment 21Very rareNot sold
Crystal triskelion fragment 3Crystal triskelion fragment 31Very rareNot sold

Universal dropsEdit

Universal drops are dropped by nearly every monster outside of Daemonheim.
These drops are dropped alongside main drops.
Item Quantity Rarity GE market price
Key tokenKey token1RareNot sold


  • When these creatures were first released, they did not drop items from the rare drop table, but did after the Queen Black Dragon update.
  • The word 'grotworm' means caveworm in Dutch.
  • Their examine text hints towards the possibility of the existence of a stronger grotworm based creature, although likely not an actual worm as "metamorphosis" implies, but none were released with them.
  • On 17 June 2013, these monsters received a massive power increase. Their life points more than tripled, their accuracy was increased greatly, and their damage output was made substantially higher. This considerably decreased the amount of botting and people in general coming to the grotworms for money. They were level 120 with 3000 life points before this update.
  • On the same 17 June 2013 update, the slayer experience rewarded increased from 73 to 360.5, to compensate for their increased strength.
  • Due to excessive botting, an update on 7 August 2012 removed several rune armour drops from the drop table of mature grotworms, replacing them with their adamant counterparts, making it less effective to earn money. The same update also removed royal bolts and super restore potions from their drop tables.

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