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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 bones1Always191

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 13,916 kills.
1 charm is dropped at a time.
Add data to the log (requires JavaScript).

Main dropsEdit

Item Quantity Rarity GE price
Adamant chainbodyAdamant chainbody1Common3,931
Adamant sq shieldAdamant sq shield1Common4,075
Rune daggerRune dagger1Common3,963
Rune helmRune helm1Common10,276
Rune maceRune mace1Common7,266
Rune longswordRune longsword1Uncommon18,038
Royal capeRoyal cape1Rare532
Grimy guamGrimy guam1Uncommon341
Grimy marrentillGrimy marrentill1Uncommon386
Grimy tarrominGrimy tarromin1Uncommon30
Grimy harralanderGrimy harralander1Uncommon85
Grimy ranarrGrimy ranarr1Rare2,385
Grimy iritGrimy irit1Rare3,157
Grimy avantoeGrimy avantoe1Rare1,312
Grimy kwuarmGrimy kwuarm1Rare5,196
Grimy cadantineGrimy cadantine1Very rare2,619
Grimy lantadymeGrimy lantadyme1Very rare2,802
Grimy dwarf weedGrimy dwarf weed1Very rare1,896
Fellstalk seed 5Fellstalk seed2Common1,050
Belladonna seed 5Belladonna seed1Rare718
Cactus seed 5Cactus seed1Rare217
Poison ivy seed 5Poison ivy seed1Rare213
Toadflax seed 5Toadflax seed1Uncommon3,664
Irit seed 5Irit seed1Rare611
Avantoe seed 5Avantoe seed1Rare502
Kwuarm seed 5Kwuarm seed1Rare7,526
Snapdragon seed 5Snapdragon seed1Very rare660
Cadantine seed 5Cadantine seed1Very rare1,377
Lantadyme seed 5Lantadyme seed1Very rare713
Dwarf weed seed 5Dwarf weed seed1Very rare703
Torstol seed 5Torstol seed1Very rare1,322
FlaxFlax50–100 (noted)Common1,950–3,900
Runite oreRunite ore1Common11,524
Adamantite oreAdamantite ore(noted)Common3,768
Royal dragonhideRoyal dragonhide1Uncommon4,823
Coins 1000Coins5,000Common5,000
Saradomin brew (2)Saradomin brew (2)1Common4,055
SharkShark2Common2,018

Tertiary dropsEdit

    
Item Quantity Rarity GE price
Long boneLong bone1RareNot sold
Curved boneCurved bone1RareNot sold
Sealed clue scroll (hard)Sealed 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 250Coins250–500Common250–500
Uncut sapphireUncut sapphire1Common861
Uncut emeraldUncut emerald1Common1,904
Uncut rubyUncut ruby1Common1,591
Uncut diamondUncut diamond1Common3,439
Uncut diamondUncut diamond45–55 (noted)Rare154,755–189,145
Loop half of a keyLoop half of a key1Common18,020
Tooth half of a keyTooth half of a key1Common21,823
Uncut dragonstoneUncut dragonstone1Uncommon11,480
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare516,600–631,400
Dragon longswordDragon longsword1Common57,594
Dragon spearDragon spear1Rare37,676
BattlestaffBattlestaff180–220 (noted)Rare1,090,620–1,332,980
Rune javelinRune javelin5Rare870
Rune platebodyRune platebody1Uncommon37,652
Rune platebodyRune platebody15–25 (noted)Rare564,780–941,300
Shield left halfShield left half1Rare64,922
Dragon helmDragon helm1Uncommon58,615
Rune arrowheads 5Rune arrowheads113–137Common28,702–34,798
Onyx bolts 5Onyx bolts135–165Very rare1,071,765–1,309,935
Chaos talismanChaos talisman1Rare1,742
Nature talismanNature talisman1Rare1,183
Water talismanWater talisman65–82 (noted)Rare435,175–548,990
Earth talismanEarth talisman65–82 (noted)Rare122,395–154,406
Fire talismanFire talisman25–35 (noted)Rare41,375–57,925
Raw lobsterRaw lobster135–165 (noted)Common29,700–36,300
Raw sharkRaw shark225–275 (noted)Uncommon255,600–312,400
Big bonesBig bones68–82 (noted)Uncommon12,988–15,662
Dragon bonesDragon bones180–220 (noted)Rare312,120–381,480
CoalCoal200–1,100 (noted)Uncommon26,400–145,200
Gold oreGold ore90–110 (noted)Common16,560–20,240
Adamantite oreAdamantite ore180–220 (noted)Uncommon226,080–276,320
Adamant barAdamant bar14–16 (noted)Common39,074–44,656
Adamant barAdamant bar135–165 (noted)Rare376,785–460,515
Runite oreRunite ore90–110 (noted)Rare1,037,160–1,267,640
Rune barRune bar(noted)Common41,565
Rune barRune bar45–55 (noted)Rare623,475–762,025
Grimy torstolGrimy torstol90–110 (noted)Uncommon318,510–389,290
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon162,360–198,440
Super restore (4)Super restore (4)45–55 (noted)Uncommon182,070–222,530
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon176,040–215,160
Lantadyme seed 5Lantadyme seed14–16Uncommon9,982–11,408
Dwarf weed seed 5Dwarf weed seed14–16Uncommon9,842–11,248
Magic seed 5Magic seed4Uncommon406,740
Palm tree seed 5Palm tree seed10Rare1,050,090
FlaxFlax450–550 (noted)Common17,550–21,450
Molten glassMolten glass45–55 (noted)Common13,050–15,950
Soft claySoft clay450–550 (noted)Uncommon206,100–251,900
Yew logsYew logs68–82 (noted)Uncommon12,852–15,498
Yew logsYew logs675–825 (noted)Rare127,575–155,925
Teak plankTeak plank45–55 (noted)Uncommon31,365–38,335
Mahogany plankMahogany plank270–330 (noted)Rare368,280–450,120
Blurberry specialBlurberry special1Uncommon3,652
Vecna skullVecna skull1Very rare*295,839
Hazelmere's signet ringHazelmere's signet ring1Very rare*1,885,212,297
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
Mimic kill tokenMimic kill token1Very rare17,873

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.