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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.

DropsEdit

100% dropEdit

Item Quantity Rarity GE price
Big bonesBig bones1Always348

CharmsEdit

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 12,217 kills.
1 charm is dropped at a time.
Add data to the log (requires JavaScript).

Main dropsEdit

Item Quantity Rarity GE price
Adamant chainbodyAdamant chainbody1Common1,939
Adamant sq shieldAdamant sq shield1Common1,696
Rune daggerRune dagger1Common3,707
Rune helmRune helm1Common9,914
Rune maceRune mace1Common6,798
Rune longswordRune longsword1Uncommon17,662
Royal capeRoyal cape1Rare645
Grimy guamGrimy guam1Uncommon180
Grimy marrentillGrimy marrentill1Uncommon233
Grimy tarrominGrimy tarromin1Uncommon37
Grimy harralanderGrimy harralander1Uncommon100
Grimy ranarrGrimy ranarr1Rare3,838
Grimy iritGrimy irit1Rare2,980
Grimy avantoeGrimy avantoe1Rare2,336
Grimy kwuarmGrimy kwuarm1Rare5,298
Grimy cadantineGrimy cadantine1Very rare4,760
Grimy lantadymeGrimy lantadyme1Very rare3,508
Grimy dwarf weedGrimy dwarf weed1Very rare2,788
Fellstalk seed 5Fellstalk seed2Common1,502
Belladonna seed 5Belladonna seed1Rare504
Cactus seed 5Cactus seed1Rare279
Poison ivy seed 5Poison ivy seed1Rare53
Toadflax seed 5Toadflax seed1Uncommon4,039
Irit seed 5Irit seed1Rare616
Avantoe seed 5Avantoe seed1Rare813
Kwuarm seed 5Kwuarm seed1Rare6,958
Snapdragon seed 5Snapdragon seed1Very rare700
Cadantine seed 5Cadantine seed1Very rare7,149
Lantadyme seed 5Lantadyme seed1Very rare2,078
Dwarf weed seed 5Dwarf weed seed1Very rare1,801
Torstol seed 5Torstol seed1Very rare4,811
FlaxFlax50–100 (noted)Common600–1,200
Runite oreRunite ore1Common11,252
Adamantite oreAdamantite ore(noted)Common3,555
Royal dragonhideRoyal dragonhide1Uncommon4,964
Coins 1000Coins5,000Common5,000
Saradomin brew (2)Saradomin brew (2)1Common5,078
SharkShark2Common1,862

Tertiary dropsEdit

    
Item Quantity Rarity GE price
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 sapphire1Common1,035
Uncut emeraldUncut emerald1Common2,133
Uncut rubyUncut ruby1Common2,702
Uncut diamondUncut diamond1Common4,001
Uncut diamondUncut diamond45–55 (noted)Rare180,045–220,055
Loop half of a keyLoop half of a key1Common18,663
Tooth half of a keyTooth half of a key1Common24,603
Uncut dragonstoneUncut dragonstone1Uncommon11,179
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare503,055–614,845
Dragon longswordDragon longsword1Common55,337
Dragon spearDragon spear1Rare36,364
BattlestaffBattlestaff180–220 (noted)Rare1,218,600–1,489,400
Rune javelinRune javelin5Rare915
Rune platebodyRune platebody1Uncommon37,407
Rune platebodyRune platebody15–25 (noted)Rare561,105–935,175
Shield left halfShield left half1Rare63,619
Dragon helmDragon helm1Uncommon58,175
Rune arrowheads 5Rune arrowheads113–137Common18,306–22,194
Onyx bolts 5Onyx bolts135–165Very rare1,045,980–1,278,420
Vecna skullVecna skull1Very rare52,200
Chaos talismanChaos talisman1Rare1,419
Nature talismanNature talisman1Rare1,065
Water talismanWater talisman65–82 (noted)Rare337,090–425,252
Earth talismanEarth talisman65–82 (noted)Rare109,460–138,088
Fire talismanFire talisman25–35 (noted)Rare35,075–49,105
Raw lobsterRaw lobster135–165 (noted)Common13,770–16,830
Raw sharkRaw shark225–275 (noted)Uncommon225,225–275,275
Big bonesBig bones72–90 (noted)Uncommon25,056–31,320
Dragon bonesDragon bones180–220 (noted)Rare292,860–357,940
CoalCoal200–1,100 (noted)Uncommon36,800–202,400
Gold oreGold ore90–110 (noted)Common12,960–15,840
Adamantite oreAdamantite ore180–220 (noted)Uncommon213,300–260,700
Adamant barAdamant bar14–16 (noted)Common36,722–41,968
Adamant barAdamant bar135–165 (noted)Rare354,105–432,795
Runite oreRunite ore90–110 (noted)Rare1,012,680–1,237,720
Rune barRune bar(noted)Common42,015
Rune barRune bar45–55 (noted)Rare630,225–770,275
Grimy torstolGrimy torstol90–110 (noted)Uncommon376,020–459,580
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon298,080–364,320
Super restore (4)Super restore (4)45–55 (noted)Uncommon251,910–307,890
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon215,010–262,790
Lantadyme seed 5Lantadyme seed14–16Uncommon29,092–33,248
Dwarf weed seed 5Dwarf weed seed14–16Uncommon25,214–28,816
Magic seed 5Magic seed4Uncommon409,652
Palm tree seed 5Palm tree seed10Rare1,928,390
FlaxFlax450–550 (noted)Common5,400–6,600
Molten glassMolten glass45–55 (noted)Common11,520–14,080
Soft claySoft clay450–550 (noted)Uncommon157,050–191,950
Yew logsYew logs68–82Uncommon14,076–16,974
Yew logsYew logs675–825 (noted)Rare139,725–170,775
Teak plankTeak plank45–55 (noted)Uncommon31,680–38,720
Mahogany plankMahogany plank270–330 (noted)Rare562,140–687,060
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

TriviaEdit

  • 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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