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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. 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. Alternatively, players could disassemble the drops for Invention experience and materials.


100% dropEdit

Item Quantity Rarity GE price
Big bonesBig bones1Always379


No charmGold charmGreen charmCrimson charmBlue charm
Represents a 90% confidence range.
Based on a sample of 11,329 kills.
1 charm is dropped at a time.
Add data to the log
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Weapons and armourEdit

Item Quantity Rarity GE price
Adamant chainbodyAdamant chainbody1Common1,907
Adamant sq shieldAdamant sq shield1Common1,158
Rune daggerRune dagger1Common3,662
Rune helmRune helm1Common10,165
Rune maceRune mace1Common7,188
Rune longswordRune longsword1Uncommon17,856
Royal capeRoyal cape1Rare786


Item Quantity Rarity GE price
Grimy guamGrimy guam1Uncommon93
Grimy marrentillGrimy marrentill1Uncommon124
Grimy tarrominGrimy tarromin1Uncommon36
Grimy harralanderGrimy harralander1Uncommon85
Grimy ranarrGrimy ranarr1Rare2,519
Grimy iritGrimy irit1Rare2,951
Grimy avantoeGrimy avantoe1Rare2,464
Grimy kwuarmGrimy kwuarm1Rare4,748
Grimy cadantineGrimy cadantine1Very rare4,984
Grimy lantadymeGrimy lantadyme1Very rare3,607
Grimy dwarf weedGrimy dwarf weed1Very rare3,469
Fellstalk seed 5Fellstalk seed2Common626
Belladonna seed 5Belladonna seed1Rare486
Cactus seed 5Cactus seed1Rare327
Poison ivy seed 5Poison ivy seed1Rare81
Toadflax seed 5Toadflax seed1Uncommon948
Irit seed 5Irit seed1Rare416
Avantoe seed 5Avantoe seed1Rare279
Kwuarm seed 5Kwuarm seed1Rare5,225
Snapdragon seed 5Snapdragon seed1Very rare493
Cadantine seed 5Cadantine seed1Very rare5,132
Lantadyme seed 5Lantadyme seed1Very rare999
Dwarf weed seed 5Dwarf weed seed1Very rare984
Torstol seed 5Torstol seed1Very rare3,260
FlaxFlax50–100 (noted)Common500–1,000
Runite oreRunite ore1Common11,464
Adamantite oreAdamantite ore(noted)Common3,762
Royal dragonhideRoyal dragonhide1Uncommon5,037


Item Quantity Rarity GE price
Coins 1000Coins5,000Common5,000
Saradomin brew (2)Saradomin brew (2)1Common4,716
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.
A ring of wealth, luck potion or collector's insignia are not required to access the table.
Show/hide rare drop table
Item Quantity Rarity GE price
Coins 1000Coins250–500; 3,000Common250–3,000
Uncut sapphireUncut sapphire1Common875
Uncut emeraldUncut emerald1Common1,591
Uncut rubyUncut ruby1Common2,632
Uncut diamondUncut diamond1Common3,988
Uncut diamondUncut diamond45–55 (noted)Rare179,460–219,340
Loop half of a keyLoop half of a key1Common18,039
Tooth half of a keyTooth half of a key1Common25,579
Uncut dragonstoneUncut dragonstone1Uncommon11,862
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare533,790–652,410
Dragon longswordDragon longsword1Common57,639
Dragon spearDragon spear1Rare36,254
BattlestaffBattlestaff180–220 (noted)Rare1,259,640–1,539,560
Rune javelinRune javelin5Rare910
Rune platebodyRune platebody1Uncommon37,620
Rune platebodyRune platebody15–25 (noted)Rare564,300–940,500
Shield left halfShield left half1Rare63,809
Dragon helmDragon helm1Uncommon58,652
Rune arrowheads 5Rune arrowheads113–137Common19,662–23,838
Onyx bolts 5Onyx bolts135–165Very rare1,078,920–1,318,680
Vecna skullVecna skull1Very rare69,802
Chaos talismanChaos talisman1Rare1,172
Nature talismanNature talisman1Rare991
Water talismanWater talisman65–82 (noted)Rare375,700–473,960
Earth talismanEarth talisman65–82 (noted)Rare112,515–141,942
Fire talismanFire talisman25–35 (noted)Rare38,175–53,445
Raw lobsterRaw lobster135–165 (noted)Common13,635–16,665
Raw sharkRaw shark225–275 (noted)Uncommon234,450–286,550
Big bonesBig bones72–90 (noted)Uncommon27,288–34,110
Dragon bonesDragon bones180–220 (noted)Rare296,100–361,900
CoalCoal200–1,100 (noted)Uncommon36,200–199,100
Gold oreGold ore90–110 (noted)Common13,500–16,500
Adamantite oreAdamantite ore180–220 (noted)Uncommon225,720–275,880
Adamant barAdamant bar14–16 (noted)Common33,054–37,776
Adamant barAdamant bar135–165 (noted)Rare318,735–389,565
Runite oreRunite ore90–110 (noted)Rare1,031,760–1,261,040
Rune barRune bar(noted)Common41,886
Rune barRune bar45–55 (noted)Rare628,290–767,910
Grimy torstolGrimy torstol90–110 (noted)Uncommon387,180–473,220
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon351,450–429,550
Super restore (4)Super restore (4)45–55 (noted)Uncommon228,105–278,795
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon143,280–175,120
Lantadyme seed 5Lantadyme seed14–16Uncommon13,986–15,984
Dwarf weed seed 5Dwarf weed seed14–16Uncommon13,776–15,744
Magic seed 5Magic seed4Uncommon482,096
Palm tree seed 5Palm tree seed10Rare1,675,240
FlaxFlax450–550 (noted)Common4,500–5,500
Molten glassMolten glass45–55 (noted)Common9,720–11,880
Soft claySoft clay450–550 (noted)Uncommon175,050–213,950
Yew logsYew logs68–82Uncommon12,852–15,498
Yew logsYew logs675–825 (noted)Rare127,575–155,925
Teak plankTeak plank45–55 (noted)Uncommon29,025–35,475
Mahogany plankMahogany plank270–330 (noted)Rare565,920–691,680
Brawling gloves (Melee)Brawling gloves (Melee)1Very rareNot sold
Brawling gloves (Magic)Brawling gloves (Magic)1Very rareNot sold
Brawling gloves (Ranged)Brawling gloves (Ranged)1Very rareNot sold
Brawling gloves (Agility)Brawling gloves (Agility)1Very rareNot sold
Brawling gloves (Cooking)Brawling gloves (Cooking)1Very rareNot sold
Brawling gloves (FM)Brawling gloves (FM)1Very rareNot sold
Brawling gloves (Fishing)Brawling gloves (Fishing)1Very rareNot sold
Brawling gloves (Hunter)Brawling gloves (Hunter)1Very rareNot sold
Brawling gloves (Mining)Brawling gloves (Mining)1Very rareNot sold
Brawling gloves (Prayer)Brawling gloves (Prayer)1Very rareNot sold
Brawling gloves (Smithing)Brawling gloves (Smithing)1Very rareNot sold
Brawling gloves (Thieving)Brawling gloves (Thieving)1Very rareNot sold
Brawling gloves (WC)Brawling gloves (WC)1Very rareNot 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 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.
Facts about "Mature grotworm"RDF feed
All Combat experience661 +
All Combat level98 +
All Is members onlytrue
All Release date22 May 2012 +
Combat experience661 +
Combat level98 +
Drop JSON{ "name": "Big bones", "quantity": [1,1], "rarity": "Always" }, { "name": "Adamant chainbody", "quantity": [1,1], "rarity": "Common" }, { "name": "Adamant sq shield", "quantity": [1,1], "rarity": "Common" }, { "name": "Rune dagger", "quantity": [1,1], "rarity": "Common" }, { "name": "Rune helm", "quantity": [1,1], "rarity": "Common" }, { "name": "Rune mace", "quantity": [1,1], "rarity": "Common" }, { "name": "Rune longsword", "quantity": [1,1], "rarity": "Uncommon" }, { "name": "Royal cape", "quantity": [1,1], "rarity": "Rare" }, { "name": "Grimy guam", "quantity": [1,1], "rarity": "Uncommon" }, { "name": "Grimy marrentill", "quantity": [1,1], "rarity": "Uncommon" }, { "name": "Grimy tarromin", "quantity": [1,1], "rarity": "Uncommon" }, { "name": "Grimy harralander", "quantity": [1,1], "rarity": "Uncommon" }, { "name": "Grimy ranarr", "quantity": [1,1], "rarity": "Rare" }, { "name": "Grimy irit", "quantity": [1,1], "rarity": "Rare" }, { "name": "Grimy avantoe", "quantity": [1,1], "rarity": "Rare" }, { "name": "Grimy kwuarm", "quantity": [1,1], "rarity": "Rare" }, { "name": "Grimy cadantine", "quantity": [1,1], "rarity": "Very rare" }, { "name": "Grimy lantadyme", "quantity": [1,1], "rarity": "Very rare" }, { "name": "Grimy dwarf weed", "quantity": [1,1], "rarity": "Very rare" }, { "name": "Fellstalk seed", "quantity": [2,2], "rarity": "Common" }, { "name": "Belladonna seed", "quantity": [1,1], "rarity": "Rare" }, { "name": "Cactus seed", "quantity": [1,1], "rarity": "Rare" }, { "name": "Poison ivy seed", "quantity": [1,1], "rarity": "Rare" }, { "name": "Toadflax seed", "quantity": [1,1], "rarity": "Uncommon" }, { "name": "Irit seed", "quantity": [1,1], "rarity": "Rare" }, { "name": "Avantoe seed", "quantity": [1,1], "rarity": "Rare" }, { "name": "Kwuarm seed", "quantity": [1,1], "rarity": "Rare" }, { "name": "Snapdragon seed", "quantity": [1,1], "rarity": "Very rare" }, { "name": "Cadantine seed", "quantity": [1,1], "rarity": "Very rare" }, { "name": "Lantadyme seed", "quantity": [1,1], "rarity": "Very rare" }, { "name": "Dwarf weed seed", "quantity": [1,1], "rarity": "Very rare" }, { "name": "Torstol seed", "quantity": [1,1], "rarity": "Very rare" }, { "name": "Flax", "quantity": [50,100], "rarity": "Common" }, { "name": "Runite ore", "quantity": [1,1], "rarity": "Common" }, { "name": "Adamantite ore", "quantity": [3,3], "rarity": "Common" }, { "name": "Royal dragonhide", "quantity": [1,1], "rarity": "Uncommon" }, { "name": "Coins", "quantity": [5000,5000], "rarity": "Common" }, { "name": "Saradomin brew (2)", "quantity": [1,1], "rarity": "Common" }, { "name": "Shark", "quantity": [2,2], "rarity": "Common" }, { "name": "Long bone", "quantity": [1,1], "rarity": "Rare" }, { "name": "Curved bone", "quantity": [1,1], "rarity": "Rare" }, { "name": "Clue scroll (hard)", "quantity": [1,1], "rarity": "Rare" }, { "name": "Spirit sapphire", "quantity": [1,1], "rarity": "Rare" }, { "name": "Spirit emerald", "quantity": [1,1], "rarity": "Rare" }, { "name": "Spirit ruby", "quantity": [1,1], "rarity": "Rare" }, { "name": "Court summons", "quantity": [1,1], "rarity": "Very rare" }, { "name": "Starved ancient effigy", "quantity": [1,1], "rarity": "Very rare" } and { "name": "Key token", "quantity": [1,1], "rarity": "Rare" }
Drops itemBig bones +, Adamant chainbody +, Adamant sq shield +, Rune dagger +, Rune helm +, Rune mace +, Rune longsword +, Royal cape +, Grimy guam +, Grimy marrentill +, Grimy tarromin +, Grimy harralander +, Grimy ranarr +, Grimy irit +, Grimy avantoe +, Grimy kwuarm +, Grimy cadantine +, Grimy lantadyme +, Grimy dwarf weed +, Fellstalk seed +, Belladonna seed +, Cactus seed +, Poison ivy seed +, Toadflax seed +, Irit seed +, Avantoe seed +, Kwuarm seed +, Snapdragon seed +, Cadantine seed +, Lantadyme seed +, Dwarf weed seed +, Torstol seed +, Flax +, Runite ore +, Adamantite ore +, Royal dragonhide +, Coins +, Saradomin brew (2) +, Shark +, Long bone +, Curved bone +, Clue scroll (hard) +, Spirit sapphire +, Spirit emerald +, Spirit ruby +, Court summons +, Starved ancient effigy + and Key token +
Drops item from RDTCoins +, Uncut sapphire +, Uncut emerald +, Uncut ruby +, Uncut diamond +, Loop half of a key +, Tooth half of a key +, Uncut dragonstone +, Dragon longsword +, Dragon spear +, Battlestaff +, Rune javelin +, Rune platebody +, Shield left half +, Dragon helm +, Rune arrowheads +, Onyx bolts +, Vecna skull +, Chaos talisman +, Nature talisman +, Water talisman +, Earth talisman +, Fire talisman +, Raw lobster +, Raw shark +, Big bones +, Dragon bones +, Coal +, Gold ore +, Adamantite ore +, Adamant bar +, Runite ore +, Rune bar +, Grimy torstol +, Grimy snapdragon +, Super restore (4) +, Prayer potion (4) +, Lantadyme seed +, Dwarf weed seed +, Magic seed +, Palm tree seed +, Flax +, Molten glass +, Soft clay +, Yew logs +, Teak plank +, Mahogany plank +, Brawling gloves (Melee) +, Brawling gloves (Magic) +, Brawling gloves (Ranged) +, Brawling gloves (Agility) +, Brawling gloves (Cooking) +, Brawling gloves (FM) +, Brawling gloves (Fishing) +, Brawling gloves (Hunter) +, Brawling gloves (Mining) +, Brawling gloves (Prayer) +, Brawling gloves (Smithing) +, Brawling gloves (Thieving) +, Brawling gloves (WC) +, Crystal triskelion fragment 1 +, Crystal triskelion fragment 2 + and Crystal triskelion fragment 3 +
Is members onlytrue
Release date22 May 2012 +

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