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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 bones1Always228

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 13,182 kills.
1 charm is dropped at a time.
Add data to the log (requires JavaScript).

Main dropsEdit

Item Quantity Rarity GE price
Adamant chainbodyAdamant chainbody1Common2,932
Adamant sq shieldAdamant sq shield1Common4,528
Rune daggerRune dagger1Common3,854
Rune helmRune helm1Common10,056
Rune maceRune mace1Common7,297
Rune longswordRune longsword1Uncommon17,766
Royal capeRoyal cape1Rare521
Grimy guamGrimy guam1Uncommon344
Grimy marrentillGrimy marrentill1Uncommon291
Grimy tarrominGrimy tarromin1Uncommon27
Grimy harralanderGrimy harralander1Uncommon95
Grimy ranarrGrimy ranarr1Rare3,084
Grimy iritGrimy irit1Rare3,348
Grimy avantoeGrimy avantoe1Rare1,670
Grimy kwuarmGrimy kwuarm1Rare5,128
Grimy cadantineGrimy cadantine1Very rare3,222
Grimy lantadymeGrimy lantadyme1Very rare2,977
Grimy dwarf weedGrimy dwarf weed1Very rare2,256
Fellstalk seed 5Fellstalk seed2Common954
Belladonna seed 5Belladonna seed1Rare914
Cactus seed 5Cactus seed1Rare278
Poison ivy seed 5Poison ivy seed1Rare110
Toadflax seed 5Toadflax seed1Uncommon3,217
Irit seed 5Irit seed1Rare340
Avantoe seed 5Avantoe seed1Rare329
Kwuarm seed 5Kwuarm seed1Rare6,544
Snapdragon seed 5Snapdragon seed1Very rare423
Cadantine seed 5Cadantine seed1Very rare2,083
Lantadyme seed 5Lantadyme seed1Very rare597
Dwarf weed seed 5Dwarf weed seed1Very rare607
Torstol seed 5Torstol seed1Very rare2,001
FlaxFlax50–100 (noted)Common1,600–3,200
Runite oreRunite ore1Common12,032
Adamantite oreAdamantite ore(noted)Common4,461
Royal dragonhideRoyal dragonhide1Uncommon4,458
Coins 1000Coins5,000Common5,000
Saradomin brew (2)Saradomin brew (2)1Common4,360
SharkShark2Common2,196

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 sapphire1Common981
Uncut emeraldUncut emerald1Common2,153
Uncut rubyUncut ruby1Common2,061
Uncut diamondUncut diamond1Common3,854
Uncut diamondUncut diamond45–55 (noted)Rare173,430–211,970
Loop half of a keyLoop half of a key1Common17,827
Tooth half of a keyTooth half of a key1Common21,365
Uncut dragonstoneUncut dragonstone1Uncommon11,272
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare507,240–619,960
Dragon longswordDragon longsword1Common56,724
Dragon spearDragon spear1Rare36,759
BattlestaffBattlestaff180–220 (noted)Rare1,088,820–1,330,780
Rune javelinRune javelin5Rare875
Rune platebodyRune platebody1Uncommon37,719
Rune platebodyRune platebody15–25 (noted)Rare565,785–942,975
Shield left halfShield left half1Rare64,843
Dragon helmDragon helm1Uncommon58,870
Rune arrowheads 5Rune arrowheads113–137Common28,363–34,387
Onyx bolts 5Onyx bolts135–165Very rare1,051,380–1,285,020
Chaos talismanChaos talisman1Rare1,605
Nature talismanNature talisman1Rare1,235
Water talismanWater talisman65–82 (noted)Rare339,885–428,778
Earth talismanEarth talisman65–82 (noted)Rare94,185–118,818
Fire talismanFire talisman25–35 (noted)Rare29,975–41,965
Raw lobsterRaw lobster135–165 (noted)Common23,490–28,710
Raw sharkRaw shark225–275 (noted)Uncommon265,275–324,225
Big bonesBig bones72–90 (noted)Uncommon16,416–20,520
Dragon bonesDragon bones180–220 (noted)Rare281,520–344,080
CoalCoal200–1,100 (noted)Uncommon26,200–144,100
Gold oreGold ore90–110 (noted)Common17,370–21,230
Adamantite oreAdamantite ore180–220 (noted)Uncommon267,660–327,140
Adamant barAdamant bar14–16 (noted)Common41,524–47,456
Adamant barAdamant bar135–165 (noted)Rare400,410–489,390
Runite oreRunite ore90–110 (noted)Rare1,082,880–1,323,520
Rune barRune bar(noted)Common41,940
Rune barRune bar45–55 (noted)Rare629,100–768,900
Grimy torstolGrimy torstol90–110 (noted)Uncommon347,670–424,930
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon244,170–298,430
Super restore (4)Super restore (4)45–55 (noted)Uncommon256,590–313,610
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon184,005–224,895
Lantadyme seed 5Lantadyme seed14–16Uncommon8,358–9,552
Dwarf weed seed 5Dwarf weed seed14–16Uncommon8,498–9,712
Magic seed 5Magic seed4Uncommon399,496
Palm tree seed 5Palm tree seed10Rare1,761,280
FlaxFlax450–550 (noted)Common14,400–17,600
Molten glassMolten glass45–55 (noted)Common11,970–14,630
Soft claySoft clay450–550 (noted)Uncommon247,500–302,500
Yew logsYew logs68–82Uncommon13,532–16,318
Yew logsYew logs675–825 (noted)Rare134,325–164,175
Teak plankTeak plank45–55 (noted)Uncommon35,145–42,955
Mahogany plankMahogany plank270–330 (noted)Rare405,000–495,000
Blurberry specialBlurberry special1Uncommon1,991
Vecna skullVecna skull1Very rare*185,069
Hazelmere's signet ringHazelmere's signet ring1Very rare*1,804,467,420
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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