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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 bones1Always381

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 12,735 kills.
1 charm is dropped at a time.
Add data to the log (requires JavaScript).

Main dropsEdit

Item Quantity Rarity GE price
Adamant chainbodyAdamant chainbody1Common1,921
Adamant sq shieldAdamant sq shield1Common1,590
Rune daggerRune dagger1Common3,653
Rune helmRune helm1Common9,808
Rune maceRune mace1Common6,982
Rune longswordRune longsword1Uncommon17,689
Royal capeRoyal cape1Rare1,027
Grimy guamGrimy guam1Uncommon115
Grimy marrentillGrimy marrentill1Uncommon169
Grimy tarrominGrimy tarromin1Uncommon31
Grimy harralanderGrimy harralander1Uncommon78
Grimy ranarrGrimy ranarr1Rare2,998
Grimy iritGrimy irit1Rare3,184
Grimy avantoeGrimy avantoe1Rare2,286
Grimy kwuarmGrimy kwuarm1Rare5,194
Grimy cadantineGrimy cadantine1Very rare4,918
Grimy lantadymeGrimy lantadyme1Very rare4,117
Grimy dwarf weedGrimy dwarf weed1Very rare2,679
Fellstalk seed 5Fellstalk seed2Common780
Belladonna seed 5Belladonna seed1Rare303
Cactus seed 5Cactus seed1Rare214
Poison ivy seed 5Poison ivy seed1Rare67
Toadflax seed 5Toadflax seed1Uncommon2,767
Irit seed 5Irit seed1Rare674
Avantoe seed 5Avantoe seed1Rare630
Kwuarm seed 5Kwuarm seed1Rare6,360
Snapdragon seed 5Snapdragon seed1Very rare905
Cadantine seed 5Cadantine seed1Very rare5,682
Lantadyme seed 5Lantadyme seed1Very rare1,473
Dwarf weed seed 5Dwarf weed seed1Very rare1,157
Torstol seed 5Torstol seed1Very rare3,022
FlaxFlax50–100 (noted)Common650–1,300
Runite oreRunite ore1Common10,615
Adamantite oreAdamantite ore(noted)Common3,411
Royal dragonhideRoyal dragonhide1Uncommon4,941
Coins 1000Coins5,000Common5,000
Saradomin brew (2)Saradomin brew (2)1Common4,926
SharkShark2Common1,984

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.
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 1000Coins250–500; 3,000Common250–3,000
Uncut sapphireUncut sapphire1Common915
Uncut emeraldUncut emerald1Common1,949
Uncut rubyUncut ruby1Common2,366
Uncut diamondUncut diamond1Common3,961
Uncut diamondUncut diamond45–55 (noted)Rare178,245–217,855
Loop half of a keyLoop half of a key1Common20,189
Tooth half of a keyTooth half of a key1Common23,060
Uncut dragonstoneUncut dragonstone1Uncommon11,118
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare500,310–611,490
Dragon longswordDragon longsword1Common55,877
Dragon spearDragon spear1Rare35,900
BattlestaffBattlestaff180–220 (noted)Rare1,216,980–1,487,420
Rune javelinRune javelin5Rare925
Rune platebodyRune platebody1Uncommon37,187
Rune platebodyRune platebody15–25 (noted)Rare557,805–929,675
Shield left halfShield left half1Rare64,251
Dragon helmDragon helm1Uncommon58,148
Rune arrowheads 5Rune arrowheads113–137Common21,470–26,030
Onyx bolts 5Onyx bolts135–165Very rare1,046,385–1,278,915
Chaos talismanChaos talisman1Rare1,316
Nature talismanNature talisman1Rare906
Water talismanWater talisman65–82 (noted)Rare377,390–476,092
Earth talismanEarth talisman65–82 (noted)Rare143,325–180,810
Fire talismanFire talisman25–35 (noted)Rare37,000–51,800
Raw lobsterRaw lobster135–165 (noted)Common18,630–22,770
Raw sharkRaw shark225–275 (noted)Uncommon261,450–319,550
Big bonesBig bones72–90 (noted)Uncommon27,432–34,290
Dragon bonesDragon bones180–220 (noted)Rare304,740–372,460
CoalCoal200–1,100 (noted)Uncommon34,800–191,400
Gold oreGold ore90–110 (noted)Common13,140–16,060
Adamantite oreAdamantite ore180–220 (noted)Uncommon204,660–250,140
Adamant barAdamant bar14–16 (noted)Common42,672–48,768
Adamant barAdamant bar135–165 (noted)Rare411,480–502,920
Runite oreRunite ore90–110 (noted)Rare955,350–1,167,650
Rune barRune bar(noted)Common41,190
Rune barRune bar45–55 (noted)Rare617,850–755,150
Grimy torstolGrimy torstol90–110 (noted)Uncommon384,030–469,370
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon298,890–365,310
Super restore (4)Super restore (4)45–55 (noted)Uncommon255,600–312,400
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon218,475–267,025
Lantadyme seed 5Lantadyme seed14–16Uncommon20,622–23,568
Dwarf weed seed 5Dwarf weed seed14–16Uncommon16,198–18,512
Magic seed 5Magic seed4Uncommon524,644
Palm tree seed 5Palm tree seed10Rare2,197,760
FlaxFlax450–550 (noted)Common5,850–7,150
Molten glassMolten glass45–55 (noted)Common14,175–17,325
Soft claySoft clay450–550 (noted)Uncommon150,300–183,700
Yew logsYew logs68–82Uncommon13,464–16,236
Yew logsYew logs675–825 (noted)Rare133,650–163,350
Teak plankTeak plank45–55 (noted)Uncommon40,230–49,170
Mahogany plankMahogany plank270–330 (noted)Rare568,080–694,320
Blurberry specialBlurberry special1Uncommon1,792
Vecna skullVecna skull1Very rare*348,450
Hazelmere's signet ringHazelmere's signet ring1Very rare*18,309,594
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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