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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.

Drops[]

100% drop[]

Item Quantity Rarity
Big bonesBig bones1Always

Charms[]

Template:Charm:Mature grotworm

Weapons and Armour[]

Item Quantity Rarity
Adamant chainbodyAdamant chainbody1Common
Adamant sq shieldAdamant sq shield1Common
Rune daggerRune dagger1Common
Rune helmRune helm1Common
Rune maceRune mace1Common
Rune longswordRune longsword1Uncommon
File:Royal cape.pngRoyal cape1Rare

Herbs[]

Item Quantity Rarity
Grimy guamGrimy guam1Uncommon
File:Grimy marrentill.pngGrimy marrentill1Uncommon
File:Grimy tarromin.pngGrimy tarromin1Uncommon
File:Grimy harralander.pngGrimy harralander1Uncommon
File:Grimy ranarr.pngGrimy ranarr1Rare
File:Grimy irit.pngGrimy irit1Rare
File:Grimy avantoe.pngGrimy avantoe1Rare
File:Grimy kwuarm.pngGrimy kwuarm1Rare
File:Grimy cadantine.pngGrimy cadantine1Very rare
File:Grimy lantadyme.pngGrimy lantadyme1Very rare
File:Grimy dwarf weed.pngGrimy dwarf weed1Very rare

Seeds[]

Item Quantity Rarity
File:Fellstalk seed.pngFellstalk seed[1]2Common
File:Belladonna seed.pngBelladonna seed1Rare
File:Cactus seed.pngCactus seed1Rare
File:Poison ivy seed.pngPoison ivy seed1Rare
File:Toadflax seed.pngToadflax seed1Uncommon
File:Irit seed.pngIrit seed1Rare
File:Avantoe seed.pngAvantoe seed1Rare
File:Kwuarm seed.pngKwuarm seed1Rare
File:Snapdragon seed.pngSnapdragon seed1Very rare
File:Cadantine seed.pngCadantine seed1Very rare
File:Lantadyme seed.pngLantadyme seed1Very rare
File:Dwarf weed seed.pngDwarf weed seed1Very rare
File:Torstol seed.pngTorstol seed1Very rare
  1. No anagogic ort is dropped along this drop.

Raw Materials[]

Item Quantity Rarity
FlaxFlax50–100 (noted)Common
Runite oreRunite ore1Common
Adamantite oreAdamantite ore3 (noted)Common
File:Royal dragonhide.pngRoyal dragonhide1Uncommon

Other[]

    
Item Quantity Rarity
Coins 1000Coins5,000Common
File:Saradomin brew (2).pngSaradomin brew (2)1Common
SharkShark2Common
File:Long bone.pngLong bone1Rare
File:Curved bone.pngCurved bone1Rare
File:Clue scroll (hard).pngClue scroll (hard)1Rare
Spirit sapphireSpirit sapphire1Rare
Spirit emeraldSpirit emerald1Rare
Spirit rubySpirit ruby1Rare
File:Court summons.pngCourt summons1Very rare
Starved ancient effigyStarved ancient effigy1Very rare

Rare drop table drops[]

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; 3,000Common
Uncut sapphireUncut sapphire1Common
Uncut emeraldUncut emerald1Common
Uncut rubyUncut ruby1Common
Uncut diamondUncut diamond1Common
Uncut diamondUncut diamond45–55 (noted)Rare
Loop half of a keyLoop half of a key1Uncommon
Tooth half of a keyTooth half of a key1Uncommon
Uncut dragonstoneUncut dragonstone1Uncommon
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare
Dragon longswordDragon longsword1Common
Dragon spearDragon spear1Uncommon
BattlestaffBattlestaff180–220 (noted)Uncommon
Rune javelinRune javelin5Rare
Rune platebodyRune platebody1Uncommon
Rune platebodyRune platebody15–25 (noted)Rare
Shield left halfShield left half1Uncommon
Dragon helmDragon helm1Uncommon
File:Rune arrowheads.pngRune arrowheads113–137Common
File:Onyx bolts.pngOnyx bolts135–165Rare
Vecna skullVecna skull1Uncommon
Chaos talismanChaos talisman1Uncommon
Nature talismanNature talisman1Uncommon
Water talismanWater talisman65–82 (noted)Rare
Earth talismanEarth talisman65–82 (noted)Rare
Fire talismanFire talisman25–35 (noted)Rare
Raw lobsterRaw lobster135–165 (noted)Uncommon
Raw sharkRaw shark225–275 (noted)Uncommon
Big bonesBig bones79–90 (noted)Uncommon
Dragon bonesDragon bones180–220 (noted)Uncommon
CoalCoal200–1,100 (noted)Uncommon
Gold oreGold ore90–110 (noted)Common
Adamantite oreAdamantite ore180–220 (noted)Uncommon
Adamant barAdamant bar15 (noted)Common
Adamant barAdamant bar135–165 (noted)Rare
Runite oreRunite ore90–110 (noted)Rare
Rune barRune bar3 (noted)Common
Rune barRune bar45–55 (noted)Rare
File:Grimy torstol.pngGrimy torstol90–110 (noted)Uncommon
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon
Super restore (4)Super restore (4)45–55 (noted)Uncommon
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon
File:Lantadyme seed.pngLantadyme seed14–16Uncommon
File:Dwarf weed seed.pngDwarf weed seed14–16Uncommon
File:Magic seed.pngMagic seed4Uncommon
File:Palm tree seed.pngPalm tree seed10Rare
FlaxFlax450–550 (noted)Common
Molten glassMolten glass45–55 (noted)Common
Soft claySoft clay450–550 (noted)Uncommon
Yew logsYew logs68–82Uncommon
Yew logsYew logs675–825 (noted)Rare
Teak plankTeak plank45–55 (noted)Uncommon
Mahogany plankMahogany plank270–330 (noted)Rare
Brawling gloves (Melee)Brawling gloves (Melee)1Rare
Brawling gloves (Magic)Brawling gloves (Magic)1Rare
Brawling gloves (Ranged)Brawling gloves (Ranged)1Rare
Brawling gloves (Agility)Brawling gloves (Agility)1Rare
Brawling gloves (Cooking)Brawling gloves (Cooking)1Rare
Brawling gloves (FM)Brawling gloves (FM)1Rare
Brawling gloves (Fishing)Brawling gloves (Fishing)1Rare
Brawling gloves (Hunter)Brawling gloves (Hunter)1Rare
Brawling gloves (Mining)Brawling gloves (Mining)1Rare
Brawling gloves (Prayer)Brawling gloves (Prayer)1Rare
Brawling gloves (Smithing)Brawling gloves (Smithing)1Rare
Brawling gloves (Thieving)Brawling gloves (Thieving)1Rare
Brawling gloves (WC)Brawling gloves (WC)1Rare
Crystal triskelion fragment 1Crystal triskelion fragment 11Very rare
Crystal triskelion fragment 2Crystal triskelion fragment 21Very rare
Crystal triskelion fragment 3Crystal triskelion fragment 31Very rare

Universal drops[]

Trivia[]

  • 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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