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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 bones1Always363

CharmsEdit

No charmGold charmGreen charmCrimson charmBlue charm
87–88%3%1–2%8–9%0.4–0.7%
Represents a 90% confidence range.
Based on a sample of 11,806 kills.
1 charm is dropped at a time.
Add data to the log
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Weapons and armourEdit

Item Quantity Rarity GE price
Adamant chainbodyAdamant chainbody1Common1,931
Adamant sq shieldAdamant sq shield1Common1,413
Rune daggerRune dagger1Common3,745
Rune helmRune helm1Common10,218
Rune maceRune mace1Common7,195
Rune longswordRune longsword1Uncommon17,867
Royal capeRoyal cape1Rare610

MaterialsEdit

Item Quantity Rarity GE price
Grimy guamGrimy guam1Uncommon129
Grimy marrentillGrimy marrentill1Uncommon195
Grimy tarrominGrimy tarromin1Uncommon33
Grimy harralanderGrimy harralander1Uncommon93
Grimy ranarrGrimy ranarr1Rare2,908
Grimy iritGrimy irit1Rare4,434
Grimy avantoeGrimy avantoe1Rare2,969
Grimy kwuarmGrimy kwuarm1Rare6,750
Grimy cadantineGrimy cadantine1Very rare6,268
Grimy lantadymeGrimy lantadyme1Very rare4,229
Grimy dwarf weedGrimy dwarf weed1Very rare3,585
Fellstalk seed 5Fellstalk seed2Common634
Belladonna seed 5Belladonna seed1Rare360
Cactus seed 5Cactus seed1Rare266
Poison ivy seed 5Poison ivy seed1Rare61
Toadflax seed 5Toadflax seed1Uncommon1,291
Irit seed 5Irit seed1Rare325
Avantoe seed 5Avantoe seed1Rare258
Kwuarm seed 5Kwuarm seed1Rare5,949
Snapdragon seed 5Snapdragon seed1Very rare477
Cadantine seed 5Cadantine seed1Very rare7,667
Lantadyme seed 5Lantadyme seed1Very rare729
Dwarf weed seed 5Dwarf weed seed1Very rare622
Torstol seed 5Torstol seed1Very rare2,015
FlaxFlax50–100 (noted)Common450–900
Runite oreRunite ore1Common11,121
Adamantite oreAdamantite ore(noted)Common3,543
Royal dragonhideRoyal dragonhide1Uncommon5,842

OtherEdit

    
Item Quantity Rarity GE price
Coins 1000Coins5,000Common5,000
Saradomin brew (2)Saradomin brew (2)1Common5,401
SharkShark2Common1,918
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 sapphire1Common1,003
Uncut emeraldUncut emerald1Common2,182
Uncut rubyUncut ruby1Common3,224
Uncut diamondUncut diamond1Common4,881
Uncut diamondUncut diamond45–55 (noted)Rare219,645–268,455
Loop half of a keyLoop half of a key1Common19,300
Tooth half of a keyTooth half of a key1Common25,461
Uncut dragonstoneUncut dragonstone1Uncommon13,583
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare611,235–747,065
Dragon longswordDragon longsword1Common57,088
Dragon spearDragon spear1Rare36,897
BattlestaffBattlestaff180–220 (noted)Rare1,249,200–1,526,800
Rune javelinRune javelin5Rare935
Rune platebodyRune platebody1Uncommon37,478
Rune platebodyRune platebody15–25 (noted)Rare562,170–936,950
Shield left halfShield left half1Rare64,159
Dragon helmDragon helm1Uncommon58,636
Rune arrowheads 5Rune arrowheads113–137Common21,809–26,441
Onyx bolts 5Onyx bolts135–165Very rare1,053,675–1,287,825
Vecna skullVecna skull1Very rare72,324
Chaos talismanChaos talisman1Rare1,410
Nature talismanNature talisman1Rare1,170
Water talismanWater talisman65–82 (noted)Rare505,180–637,304
Earth talismanEarth talisman65–82 (noted)Rare154,700–195,160
Fire talismanFire talisman25–35 (noted)Rare49,050–68,670
Raw lobsterRaw lobster135–165 (noted)Common14,445–17,655
Raw sharkRaw shark225–275 (noted)Uncommon254,475–311,025
Big bonesBig bones72–90 (noted)Uncommon26,136–32,670
Dragon bonesDragon bones180–220 (noted)Rare300,600–367,400
CoalCoal200–1,100 (noted)Uncommon35,200–193,600
Gold oreGold ore90–110 (noted)Common12,870–15,730
Adamantite oreAdamantite ore180–220 (noted)Uncommon212,580–259,820
Adamant barAdamant bar14–16 (noted)Common39,914–45,616
Adamant barAdamant bar135–165 (noted)Rare384,885–470,415
Runite oreRunite ore90–110 (noted)Rare1,000,890–1,223,310
Rune barRune bar(noted)Common41,517
Rune barRune bar45–55 (noted)Rare622,755–761,145
Grimy torstolGrimy torstol90–110 (noted)Uncommon436,860–533,940
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon489,240–597,960
Super restore (4)Super restore (4)45–55 (noted)Uncommon279,990–342,210
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon175,770–214,830
Lantadyme seed 5Lantadyme seed14–16Uncommon10,206–11,664
Dwarf weed seed 5Dwarf weed seed14–16Uncommon8,708–9,952
Magic seed 5Magic seed4Uncommon387,108
Palm tree seed 5Palm tree seed10Rare1,454,950
FlaxFlax450–550 (noted)Common4,050–4,950
Molten glassMolten glass45–55 (noted)Common11,025–13,475
Soft claySoft clay450–550 (noted)Uncommon145,800–178,200
Yew logsYew logs68–82Uncommon12,920–15,580
Yew logsYew logs675–825 (noted)Rare128,250–156,750
Teak plankTeak plank45–55 (noted)Uncommon39,780–48,620
Mahogany plankMahogany plank270–330 (noted)Rare656,640–802,560
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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