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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.

Drops

100% drop

Item Quantity Rarity GE price
Big bonesBig bones1Always222

Charms

No charmGold charmGreen charmCrimson charmBlue charm
87–88%3%1–2%8–9%0.5–0.7%
Represents a 90% confidence range based on a sample of 14,187 kills.
1 charm is dropped at a time.
Add data to the log (requires JavaScript).

Main drops

Item Quantity Rarity GE price
Adamant chainbodyAdamant chainbody1Common4,130
Adamant sq shieldAdamant sq shield1Common4,550
Rune daggerRune dagger1Common3,951
Rune helmRune helm1Common9,814
Rune maceRune mace1Common7,094
Rune longswordRune longsword1Uncommon17,886
Off-hand rune daggerOff-hand rune dagger1Common3,647
Off-hand rune maceOff-hand rune mace1Common7,599
Off-hand rune longswordOff-hand rune longsword1Uncommon17,769
Royal capeRoyal cape1Rare528
Grimy guamGrimy guam1Uncommon380
Grimy marrentillGrimy marrentill1Uncommon310
Grimy tarrominGrimy tarromin1Uncommon28
Grimy harralanderGrimy harralander1Uncommon71
Grimy ranarrGrimy ranarr1Rare1,751
Grimy iritGrimy irit1Rare3,961
Grimy avantoeGrimy avantoe1Rare831
Grimy kwuarmGrimy kwuarm1Rare6,781
Grimy cadantineGrimy cadantine1Very rare2,607
Grimy lantadymeGrimy lantadyme1Very rare4,365
Grimy dwarf weedGrimy dwarf weed1Very rare3,225
Fellstalk seed 5Fellstalk seed2Common764
Belladonna seed 5Belladonna seed1Rare905
Cactus seed 5Cactus seed1Rare63
Poison ivy seed 5Poison ivy seed1Rare179
Toadflax seed 5Toadflax seed1Uncommon2,076
Irit seed 5Irit seed1Rare452
Avantoe seed 5Avantoe seed1Rare252
Kwuarm seed 5Kwuarm seed1Rare7,587
Snapdragon seed 5Snapdragon seed1Very rare263
Cadantine seed 5Cadantine seed1Very rare1,105
Lantadyme seed 5Lantadyme seed1Very rare226
Dwarf weed seed 5Dwarf weed seed1Very rare370
Torstol seed 5Torstol seed1Very rare793
FlaxFlax50–100 (noted)Common2,300–4,600
Runite oreRunite ore1Common11,349
Adamantite oreAdamantite ore(noted)Common4,032
Royal dragonhideRoyal dragonhide1Uncommon5,214
Coins 1000Coins5,000Common5,000
Saradomin brew (2)Saradomin brew (2)1Common2,501
Super restore (2)Super restore (2)1Common1,154
SharkShark2Common1,618

Tertiary drops

    
Item Quantity Rarity GE price
Long boneLong bone1RareNot sold
Curved boneCurved bone1RareNot sold
Sealed clue scroll (hard)Sealed 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 drops

This monster has access to the rare drop table.
Luck-enhancing items such as a ring of wealth or luck of the dwarves are not required to access the table.
Show/hide rare drop table
Item Quantity Rarity GE price
Coins 250Coins250–500Common250–500
Uncut sapphireUncut sapphire1Common403
Uncut emeraldUncut emerald1Common1,196
Uncut rubyUncut ruby1Common1,064
Uncut diamondUncut diamond1Common2,630
Uncut diamondUncut diamond45–55 (noted)Rare118,350–144,650
Loop half of a keyLoop half of a key1Common14,961
Tooth half of a keyTooth half of a key1Common17,892
Uncut dragonstoneUncut dragonstone1Uncommon11,317
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare509,265–622,435
Dragon longswordDragon longsword1Common57,477
Dragon spearDragon spear1Rare35,169
BattlestaffBattlestaff180–220 (noted)Rare1,130,580–1,381,820
Rune javelinRune javelin5Rare840
Rune platebodyRune platebody1Uncommon37,426
Rune platebodyRune platebody15–25 (noted)Rare561,390–935,650
Shield left halfShield left half1Rare64,779
Dragon helmDragon helm1Uncommon58,616
Rune arrowheads 5Rune arrowheads113–137Common26,442–32,058
Onyx bolts 5Onyx bolts135–165Very rare1,069,335–1,306,965
Chaos talismanChaos talisman1Rare1,212
Nature talismanNature talisman1Rare989
Water talismanWater talisman65–82 (noted)Rare572,130–721,764
Earth talismanEarth talisman65–82 (noted)Rare192,010–242,228
Fire talismanFire talisman25–35 (noted)Rare54,700–76,580
Raw lobsterRaw lobster135–165 (noted)Common21,600–26,400
Raw sharkRaw shark225–275 (noted)Uncommon249,525–304,975
Big bonesBig bones68–82 (noted)Uncommon15,096–18,204
Dragon bonesDragon bones180–220 (noted)Rare298,800–365,200
CoalCoal200–1,100 (noted)Uncommon28,000–154,000
Gold oreGold ore90–110 (noted)Common13,770–16,830
Adamantite oreAdamantite ore180–220 (noted)Uncommon241,920–295,680
Adamant barAdamant bar14–16 (noted)Common50,722–57,968
Adamant barAdamant bar135–165 (noted)Rare489,105–597,795
Runite oreRunite ore90–110 (noted)Rare1,021,410–1,248,390
Rune barRune bar(noted)Common41,826
Rune barRune bar45–55 (noted)Rare627,390–766,810
Grimy torstolGrimy torstol90–110 (noted)Uncommon316,080–386,320
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon99,180–121,220
Super restore (4)Super restore (4)45–55 (noted)Uncommon127,845–156,255
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon121,050–147,950
Lantadyme seed 5Lantadyme seed14–16Uncommon3,164–3,616
Dwarf weed seed 5Dwarf weed seed14–16Uncommon5,180–5,920
Magic seed 5Magic seed4Uncommon351,132
Palm tree seed 5Palm tree seed10Rare796,390
FlaxFlax450–550 (noted)Common20,700–25,300
Molten glassMolten glass45–55 (noted)Common4,545–5,555
Soft claySoft clay450–550 (noted)Uncommon189,000–231,000
Yew logsYew logs68–82 (noted)Uncommon9,928–11,972
Yew logsYew logs675–825 (noted)Rare98,550–120,450
Teak plankTeak plank45–55 (noted)Uncommon20,565–25,135
Mahogany plankMahogany plank270–330 (noted)Rare240,840–294,360
Blurberry SpecialBlurberry Special1Uncommon8,475
Vecna skullVecna skull1Very rare*220,994
Hazelmere's signet ringHazelmere's signet ring1Very rare*2,052,582,424
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 drops

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
Mimic kill tokenMimic kill token1Very rare10,317

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.