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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 bones1Always384

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 13,063 kills.
1 charm is dropped at a time.
Add data to the log (requires JavaScript).

Main dropsEdit

Item Quantity Rarity GE price
Adamant chainbodyAdamant chainbody1Common2,045
Adamant sq shieldAdamant sq shield1Common1,645
Rune daggerRune dagger1Common3,439
Rune helmRune helm1Common10,079
Rune maceRune mace1Common6,833
Rune longswordRune longsword1Uncommon17,784
Royal capeRoyal cape1Rare962
Grimy guamGrimy guam1Uncommon177
Grimy marrentillGrimy marrentill1Uncommon224
Grimy tarrominGrimy tarromin1Uncommon33
Grimy harralanderGrimy harralander1Uncommon98
Grimy ranarrGrimy ranarr1Rare3,392
Grimy iritGrimy irit1Rare3,490
Grimy avantoeGrimy avantoe1Rare2,399
Grimy kwuarmGrimy kwuarm1Rare5,737
Grimy cadantineGrimy cadantine1Very rare5,071
Grimy lantadymeGrimy lantadyme1Very rare4,109
Grimy dwarf weedGrimy dwarf weed1Very rare2,887
Fellstalk seed 5Fellstalk seed2Common912
Belladonna seed 5Belladonna seed1Rare659
Cactus seed 5Cactus seed1Rare172
Poison ivy seed 5Poison ivy seed1Rare107
Toadflax seed 5Toadflax seed1Uncommon3,101
Irit seed 5Irit seed1Rare812
Avantoe seed 5Avantoe seed1Rare449
Kwuarm seed 5Kwuarm seed1Rare7,641
Snapdragon seed 5Snapdragon seed1Very rare669
Cadantine seed 5Cadantine seed1Very rare5,155
Lantadyme seed 5Lantadyme seed1Very rare1,006
Dwarf weed seed 5Dwarf weed seed1Very rare981
Torstol seed 5Torstol seed1Very rare1,783
FlaxFlax50–100 (noted)Common900–1,800
Runite oreRunite ore1Common10,853
Adamantite oreAdamantite ore(noted)Common3,813
Royal dragonhideRoyal dragonhide1Uncommon5,314
Coins 1000Coins5,000Common5,000
Saradomin brew (2)Saradomin brew (2)1Common4,783
SharkShark2Common2,586

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 sapphire1Common1,056
Uncut emeraldUncut emerald1Common2,248
Uncut rubyUncut ruby1Common2,674
Uncut diamondUncut diamond1Common4,377
Uncut diamondUncut diamond45–55 (noted)Rare196,965–240,735
Loop half of a keyLoop half of a key1Common18,553
Tooth half of a keyTooth half of a key1Common23,087
Uncut dragonstoneUncut dragonstone1Uncommon12,754
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare573,930–701,470
Dragon longswordDragon longsword1Common55,335
Dragon spearDragon spear1Rare35,904
BattlestaffBattlestaff180–220 (noted)Rare1,216,800–1,487,200
Rune javelinRune javelin5Rare890
Rune platebodyRune platebody1Uncommon37,190
Rune platebodyRune platebody15–25 (noted)Rare557,850–929,750
Shield left halfShield left half1Rare64,194
Dragon helmDragon helm1Uncommon58,019
Rune arrowheads 5Rune arrowheads113–137Common22,035–26,715
Onyx bolts 5Onyx bolts135–165Very rare1,044,360–1,276,440
Chaos talismanChaos talisman1Rare1,638
Nature talismanNature talisman1Rare1,798
Water talismanWater talisman65–82 (noted)Rare412,425–520,290
Earth talismanEarth talisman65–82 (noted)Rare139,035–175,398
Fire talismanFire talisman25–35 (noted)Rare36,150–50,610
Raw lobsterRaw lobster135–165 (noted)Common19,440–23,760
Raw sharkRaw shark225–275 (noted)Uncommon299,025–365,475
Big bonesBig bones72–90 (noted)Uncommon27,648–34,560
Dragon bonesDragon bones180–220 (noted)Rare264,060–322,740
CoalCoal200–1,100 (noted)Uncommon30,400–167,200
Gold oreGold ore90–110 (noted)Common14,040–17,160
Adamantite oreAdamantite ore180–220 (noted)Uncommon228,780–279,620
Adamant barAdamant bar14–16 (noted)Common40,866–46,704
Adamant barAdamant bar135–165 (noted)Rare394,065–481,635
Runite oreRunite ore90–110 (noted)Rare976,770–1,193,830
Rune barRune bar(noted)Common41,454
Rune barRune bar45–55 (noted)Rare621,810–759,990
Grimy torstolGrimy torstol90–110 (noted)Uncommon422,100–515,900
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon299,700–366,300
Super restore (4)Super restore (4)45–55 (noted)Uncommon283,320–346,280
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon222,885–272,415
Lantadyme seed 5Lantadyme seed14–16Uncommon14,084–16,096
Dwarf weed seed 5Dwarf weed seed14–16Uncommon13,734–15,696
Magic seed 5Magic seed4Uncommon459,276
Palm tree seed 5Palm tree seed10Rare1,794,660
FlaxFlax450–550 (noted)Common8,100–9,900
Molten glassMolten glass45–55 (noted)Common12,330–15,070
Soft claySoft clay450–550 (noted)Uncommon319,050–389,950
Yew logsYew logs68–82Uncommon12,852–15,498
Yew logsYew logs675–825 (noted)Rare127,575–155,925
Teak plankTeak plank45–55 (noted)Uncommon45,810–55,990
Mahogany plankMahogany plank270–330 (noted)Rare635,580–776,820
Blurberry specialBlurberry special1Uncommon1,820
Vecna skullVecna skull1Very rare*206,092
Hazelmere's signet ringHazelmere's signet ring1Very rare*66,731,724
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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