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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 bones1Always166

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 chainbody1Common7,111
Adamant sq shieldAdamant sq shield1Common5,225
Rune daggerRune dagger1Common4,141
Rune helmRune helm1Common10,533
Rune maceRune mace1Common7,165
Rune longswordRune longsword1Uncommon17,883
Off-hand rune daggerOff-hand rune dagger1Common3,842
Off-hand rune maceOff-hand rune mace1Common7,202
Off-hand rune longswordOff-hand rune longsword1Uncommon18,210
Royal capeRoyal cape1Rare913
Grimy guamGrimy guam1Uncommon368
Grimy marrentillGrimy marrentill1Uncommon3,253
Grimy tarrominGrimy tarromin1Uncommon97
Grimy harralanderGrimy harralander1Uncommon158
Grimy ranarrGrimy ranarr1Rare2,133
Grimy iritGrimy irit1Rare4,511
Grimy avantoeGrimy avantoe1Rare1,430
Grimy kwuarmGrimy kwuarm1Rare15,212
Grimy cadantineGrimy cadantine1Very rare3,232
Grimy lantadymeGrimy lantadyme1Very rare10,150
Grimy dwarf weedGrimy dwarf weed1Very rare10,113
Fellstalk seed 5Fellstalk seed2Common1,030
Belladonna seed 5Belladonna seed1Rare968
Cactus seed 5Cactus seed1Rare106
Poison ivy seed 5Poison ivy seed1Rare91
Toadflax seed 5Toadflax seed1Uncommon1,637
Irit seed 5Irit seed1Rare951
Avantoe seed 5Avantoe seed1Rare481
Kwuarm seed 5Kwuarm seed1Rare27,862
Snapdragon seed 5Snapdragon seed1Very rare423
Cadantine seed 5Cadantine seed1Very rare1,317
Lantadyme seed 5Lantadyme seed1Very rare1,046
Dwarf weed seed 5Dwarf weed seed1Very rare859
Torstol seed 5Torstol seed1Very rare1,683
FlaxFlax50–100 (noted)Common4,600–9,200
Runite oreRunite ore1Common1,060
Adamantite oreAdamantite ore(noted)Common759
Royal dragonhideRoyal dragonhide1Uncommon4,793
Coins 1000Coins5,000Common5,000
Saradomin brew (2)Saradomin brew (2)1Common3,574
Super restore (2)Super restore (2)1Common1,816
SharkShark2Common1,252

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 sapphire1Common431
Uncut emeraldUncut emerald1Common836
Uncut rubyUncut ruby1Common1,301
Uncut diamondUncut diamond1Common2,770
Uncut diamondUncut diamond45–55 (noted)Rare124,650–152,350
Loop half of a keyLoop half of a key1Common11,788
Tooth half of a keyTooth half of a key1Common15,170
Uncut dragonstoneUncut dragonstone1Uncommon12,742
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare573,390–700,810
Dragon longswordDragon longsword1Common58,119
Dragon spearDragon spear1Rare34,893
BattlestaffBattlestaff180–220 (noted)Rare649,440–793,760
Rune javelinRune javelin5Rare900
Rune platebodyRune platebody1Uncommon37,480
Rune platebodyRune platebody15–25 (noted)Rare562,200–937,000
Shield left halfShield left half1Rare64,894
Dragon helmDragon helm1Uncommon58,972
Rune arrowheads 5Rune arrowheads113–137Common14,351–17,399
Onyx bolts 5Onyx bolts135–165Very rare1,065,690–1,302,510
Chaos talismanChaos talisman1Rare1,354
Nature talismanNature talisman1Rare1,190
Water talismanWater talisman65–82 (noted)Rare253,110–319,308
Earth talismanEarth talisman65–82 (noted)Rare11,375–14,350
Fire talismanFire talisman25–35 (noted)Rare7,825–10,955
Raw lobsterRaw lobster135–165 (noted)Common58,590–71,610
Raw sharkRaw shark225–275 (noted)Uncommon202,275–247,225
Big bonesBig bones68–82 (noted)Uncommon11,288–13,612
Dragon bonesDragon bones180–220 (noted)Rare336,780–411,620
CoalCoal200–1,100 (noted)Uncommon23,600–129,800
Gold oreGold ore90–110 (noted)Common33,030–40,370
Adamantite oreAdamantite ore180–220 (noted)Uncommon45,540–55,660
Adamant barAdamant bar14–16 (noted)Common19,852–22,688
Adamant barAdamant bar135–165 (noted)Rare191,430–233,970
Runite oreRunite ore90–110 (noted)Rare95,400–116,600
Rune barRune bar(noted)Common6,618
Rune barRune bar45–55 (noted)Rare99,270–121,330
Grimy torstolGrimy torstol90–110 (noted)Uncommon740,970–905,630
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon176,490–215,710
Super restore (4)Super restore (4)45–55 (noted)Uncommon178,470–218,130
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon166,950–204,050
Lantadyme seed 5Lantadyme seed14–16Uncommon14,644–16,736
Dwarf weed seed 5Dwarf weed seed14–16Uncommon12,026–13,744
Magic seed 5Magic seed4Uncommon205,084
Palm tree seed 5Palm tree seed10Rare505,810
FlaxFlax450–550 (noted)Common41,400–50,600
Molten glassMolten glass45–55 (noted)Common12,060–14,740
Soft claySoft clay450–550 (noted)Uncommon272,700–333,300
Yew logsYew logs68–82 (noted)Uncommon12,036–14,514
Yew logsYew logs675–825 (noted)Rare119,475–146,025
Teak plankTeak plank45–55 (noted)Uncommon15,075–18,425
Mahogany plankMahogany plank270–330 (noted)Rare237,330–290,070
Blurberry SpecialBlurberry Special1Uncommon17,225
Vecna skullVecna skull1Very rare*74,132
Hazelmere's signet ringHazelmere's signet ring1Very rare*1,590,640,621
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 rare9,031

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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