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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 bones1Always157

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 cape1Rare730
Grimy guamGrimy guam1Uncommon355
Grimy marrentillGrimy marrentill1Uncommon4,011
Grimy tarrominGrimy tarromin1Uncommon49
Grimy harralanderGrimy harralander1Uncommon143
Grimy ranarrGrimy ranarr1Rare1,304
Grimy iritGrimy irit1Rare2,987
Grimy avantoeGrimy avantoe1Rare711
Grimy kwuarmGrimy kwuarm1Rare5,945
Grimy cadantineGrimy cadantine1Very rare1,730
Grimy lantadymeGrimy lantadyme1Very rare4,555
Grimy dwarf weedGrimy dwarf weed1Very rare3,836
Fellstalk seed 5Fellstalk seed2Common428
Belladonna seed 5Belladonna seed1Rare550
Cactus seed 5Cactus seed1Rare96
Poison ivy seed 5Poison ivy seed1Rare67
Toadflax seed 5Toadflax seed1Uncommon2,465
Irit seed 5Irit seed1Rare496
Avantoe seed 5Avantoe seed1Rare252
Kwuarm seed 5Kwuarm seed1Rare6,459
Snapdragon seed 5Snapdragon seed1Very rare264
Cadantine seed 5Cadantine seed1Very rare835
Lantadyme seed 5Lantadyme seed1Very rare350
Dwarf weed seed 5Dwarf weed seed1Very rare308
Torstol seed 5Torstol seed1Very rare700
FlaxFlax50–100 (noted)Common4,500–9,000
Runite oreRunite ore1Common1,043
Adamantite oreAdamantite ore(noted)Common723
Royal dragonhideRoyal dragonhide1Uncommon4,410
Coins 1000Coins5,000Common5,000
Saradomin brew (2)Saradomin brew (2)1Common3,906
Super restore (2)Super restore (2)1Common1,803
SharkShark2Common1,282

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 sapphire1Common397
Uncut emeraldUncut emerald1Common726
Uncut rubyUncut ruby1Common1,223
Uncut diamondUncut diamond1Common2,545
Uncut diamondUncut diamond45–55 (noted)Rare114,525–139,975
Loop half of a keyLoop half of a key1Common10,388
Tooth half of a keyTooth half of a key1Common13,827
Uncut dragonstoneUncut dragonstone1Uncommon12,108
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare544,860–665,940
Dragon longswordDragon longsword1Common58,171
Dragon spearDragon spear1Rare36,444
BattlestaffBattlestaff180–220 (noted)Rare725,040–886,160
Rune javelinRune javelin5Rare910
Rune platebodyRune platebody1Uncommon37,480
Rune platebodyRune platebody15–25 (noted)Rare562,200–937,000
Shield left halfShield left half1Rare64,829
Dragon helmDragon helm1Uncommon58,958
Rune arrowheads 5Rune arrowheads113–137Common15,368–18,632
Onyx bolts 5Onyx bolts135–165Very rare1,053,810–1,287,990
Chaos talismanChaos talisman1Rare1,338
Nature talismanNature talisman1Rare999
Water talismanWater talisman65–82 (noted)Rare259,610–327,508
Earth talismanEarth talisman65–82 (noted)Rare15,600–19,680
Fire talismanFire talisman25–35 (noted)Rare9,375–13,125
Raw lobsterRaw lobster135–165 (noted)Common28,350–34,650
Raw sharkRaw shark225–275 (noted)Uncommon173,025–211,475
Big bonesBig bones68–82 (noted)Uncommon10,676–12,874
Dragon bonesDragon bones180–220 (noted)Rare321,660–393,140
CoalCoal200–1,100 (noted)Uncommon23,200–127,600
Gold oreGold ore90–110 (noted)Common33,840–41,360
Adamantite oreAdamantite ore180–220 (noted)Uncommon43,380–53,020
Adamant barAdamant bar14–16 (noted)Common22,918–26,192
Adamant barAdamant bar135–165 (noted)Rare220,995–270,105
Runite oreRunite ore90–110 (noted)Rare93,870–114,730
Rune barRune bar(noted)Common7,107
Rune barRune bar45–55 (noted)Rare106,605–130,295
Grimy torstolGrimy torstol90–110 (noted)Uncommon355,590–434,610
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon111,780–136,620
Super restore (4)Super restore (4)45–55 (noted)Uncommon178,155–217,745
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon127,215–155,485
Lantadyme seed 5Lantadyme seed14–16Uncommon4,900–5,600
Dwarf weed seed 5Dwarf weed seed14–16Uncommon4,312–4,928
Magic seed 5Magic seed4Uncommon104,348
Palm tree seed 5Palm tree seed10Rare277,870
FlaxFlax450–550 (noted)Common40,500–49,500
Molten glassMolten glass45–55 (noted)Common11,835–14,465
Soft claySoft clay450–550 (noted)Uncommon294,300–359,700
Yew logsYew logs68–82 (noted)Uncommon11,288–13,612
Yew logsYew logs675–825 (noted)Rare112,050–136,950
Teak plankTeak plank45–55 (noted)Uncommon14,670–17,930
Mahogany plankMahogany plank270–330 (noted)Rare223,020–272,580
Blurberry SpecialBlurberry Special1Uncommon9,095
Vecna skullVecna skull1Very rare*131,137
Hazelmere's signet ringHazelmere's signet ring1Very rare*1,671,277,144
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 rare9,624

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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