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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 bones1Always352

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 11,329 kills.
1 charm is dropped at a time.
Add data to the log
(Requires JavaScript to be enabled)

Weapons and armourEdit

Item Quantity Rarity GE price
Adamant chainbodyAdamant chainbody1Common2,342
Adamant sq shieldAdamant sq shield1Common2,012
Rune daggerRune dagger1Common3,880
Rune helmRune helm1Common10,378
Rune maceRune mace1Common7,385
Rune longswordRune longsword1Uncommon18,083
Royal capeRoyal cape1Rare711

MaterialsEdit

Item Quantity Rarity GE price
Grimy guamGrimy guam1Uncommon104
Grimy marrentillGrimy marrentill1Uncommon135
Grimy tarrominGrimy tarromin1Uncommon37
Grimy harralanderGrimy harralander1Uncommon85
Grimy ranarrGrimy ranarr1Rare2,422
Grimy iritGrimy irit1Rare2,992
Grimy avantoeGrimy avantoe1Rare2,638
Grimy kwuarmGrimy kwuarm1Rare5,432
Grimy cadantineGrimy cadantine1Very rare4,714
Grimy lantadymeGrimy lantadyme1Very rare3,474
Grimy dwarf weedGrimy dwarf weed1Very rare3,296
Fellstalk seed 5Fellstalk seed2Common740
Belladonna seed 5Belladonna seed1Rare517
Cactus seed 5Cactus seed1Rare303
Poison ivy seed 5Poison ivy seed1Rare90
Toadflax seed 5Toadflax seed1Uncommon1,016
Irit seed 5Irit seed1Rare382
Avantoe seed 5Avantoe seed1Rare303
Kwuarm seed 5Kwuarm seed1Rare6,286
Snapdragon seed 5Snapdragon seed1Very rare361
Cadantine seed 5Cadantine seed1Very rare5,680
Lantadyme seed 5Lantadyme seed1Very rare732
Dwarf weed seed 5Dwarf weed seed1Very rare632
Torstol seed 5Torstol seed1Very rare1,740
FlaxFlax50–100 (noted)Common500–1,000
Runite oreRunite ore1Common11,254
Adamantite oreAdamantite ore(noted)Common4,533
Royal dragonhideRoyal dragonhide1Uncommon4,861

OtherEdit

    
Item Quantity Rarity GE price
Coins 1000Coins5,000Common5,000
Saradomin brew (2)Saradomin brew (2)1Common4,910
SharkShark2Common1,710
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 sapphire1Common920
Uncut emeraldUncut emerald1Common1,572
Uncut rubyUncut ruby1Common2,746
Uncut diamondUncut diamond1Common3,970
Uncut diamondUncut diamond45–55 (noted)Rare178,650–218,350
Loop half of a keyLoop half of a key1Common17,132
Tooth half of a keyTooth half of a key1Common23,927
Uncut dragonstoneUncut dragonstone1Uncommon12,620
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare567,900–694,100
Dragon longswordDragon longsword1Common56,838
Dragon spearDragon spear1Rare35,691
BattlestaffBattlestaff180–220 (noted)Rare1,248,300–1,525,700
Rune javelinRune javelin5Rare910
Rune platebodyRune platebody1Uncommon37,784
Rune platebodyRune platebody15–25 (noted)Rare566,760–944,600
Shield left halfShield left half1Rare64,218
Dragon helmDragon helm1Uncommon58,358
Rune arrowheads 5Rune arrowheads113–137Common20,792–25,208
Onyx bolts 5Onyx bolts135–165Very rare1,043,415–1,275,285
Vecna skullVecna skull1Very rare77,794
Chaos talismanChaos talisman1Rare1,656
Nature talismanNature talisman1Rare1,191
Water talismanWater talisman65–82 (noted)Rare400,530–505,284
Earth talismanEarth talisman65–82 (noted)Rare116,090–146,452
Fire talismanFire talisman25–35 (noted)Rare39,875–55,825
Raw lobsterRaw lobster135–165 (noted)Common14,985–18,315
Raw sharkRaw shark225–275 (noted)Uncommon227,700–278,300
Big bonesBig bones72–90 (noted)Uncommon25,344–31,680
Dragon bonesDragon bones180–220 (noted)Rare293,400–358,600
CoalCoal200–1,100 (noted)Uncommon44,600–245,300
Gold oreGold ore90–110 (noted)Common13,050–15,950
Adamantite oreAdamantite ore180–220 (noted)Uncommon271,980–332,420
Adamant barAdamant bar14–16 (noted)Common32,746–37,424
Adamant barAdamant bar135–165 (noted)Rare315,765–385,935
Runite oreRunite ore90–110 (noted)Rare1,012,860–1,237,940
Rune barRune bar(noted)Common42,168
Rune barRune bar45–55 (noted)Rare632,520–773,080
Grimy torstolGrimy torstol90–110 (noted)Uncommon386,640–472,560
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon366,300–447,700
Super restore (4)Super restore (4)45–55 (noted)Uncommon230,040–281,160
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon160,335–195,965
Lantadyme seed 5Lantadyme seed14–16Uncommon10,248–11,712
Dwarf weed seed 5Dwarf weed seed14–16Uncommon8,848–10,112
Magic seed 5Magic seed4Uncommon433,044
Palm tree seed 5Palm tree seed10Rare1,796,080
FlaxFlax450–550 (noted)Common4,500–5,500
Molten glassMolten glass45–55 (noted)Common7,650–9,350
Soft claySoft clay450–550 (noted)Uncommon160,200–195,800
Yew logsYew logs68–82Uncommon13,056–15,744
Yew logsYew logs675–825 (noted)Rare129,600–158,400
Teak plankTeak plank45–55 (noted)Uncommon34,065–41,635
Mahogany plankMahogany plank270–330 (noted)Rare572,130–699,270
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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