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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 bones1Always373

CharmsEdit

No charmGold charmGreen charmCrimson charmBlue charm
87%3%1–2%8–9%0.5–0.7%
Represents a 90% confidence range based on a sample of 12,444 kills.
1 charm is dropped at a time.
Add data to the log (requires JavaScript).

Main dropsEdit

Item Quantity Rarity GE price
Adamant chainbodyAdamant chainbody1Common1,683
Adamant sq shieldAdamant sq shield1Common1,185
Rune daggerRune dagger1Common3,572
Rune helmRune helm1Common9,840
Rune maceRune mace1Common6,804
Rune longswordRune longsword1Uncommon17,648
Royal capeRoyal cape1Rare890
Grimy guamGrimy guam1Uncommon194
Grimy marrentillGrimy marrentill1Uncommon206
Grimy tarrominGrimy tarromin1Uncommon35
Grimy harralanderGrimy harralander1Uncommon89
Grimy ranarrGrimy ranarr1Rare3,451
Grimy iritGrimy irit1Rare3,533
Grimy avantoeGrimy avantoe1Rare2,531
Grimy kwuarmGrimy kwuarm1Rare5,715
Grimy cadantineGrimy cadantine1Very rare5,549
Grimy lantadymeGrimy lantadyme1Very rare3,953
Grimy dwarf weedGrimy dwarf weed1Very rare2,940
Fellstalk seed 5Fellstalk seed2Common1,534
Belladonna seed 5Belladonna seed1Rare343
Cactus seed 5Cactus seed1Rare223
Poison ivy seed 5Poison ivy seed1Rare57
Toadflax seed 5Toadflax seed1Uncommon3,313
Irit seed 5Irit seed1Rare690
Avantoe seed 5Avantoe seed1Rare715
Kwuarm seed 5Kwuarm seed1Rare7,766
Snapdragon seed 5Snapdragon seed1Very rare773
Cadantine seed 5Cadantine seed1Very rare5,530
Lantadyme seed 5Lantadyme seed1Very rare2,050
Dwarf weed seed 5Dwarf weed seed1Very rare1,898
Torstol seed 5Torstol seed1Very rare3,781
FlaxFlax50–100 (noted)Common600–1,200
Runite oreRunite ore1Common10,835
Adamantite oreAdamantite ore(noted)Common3,843
Royal dragonhideRoyal dragonhide1Uncommon5,366
Coins 1000Coins5,000Common5,000
Saradomin brew (2)Saradomin brew (2)1Common4,701
SharkShark2Common1,888

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 sapphire1Common979
Uncut emeraldUncut emerald1Common2,311
Uncut rubyUncut ruby1Common2,852
Uncut diamondUncut diamond1Common4,300
Uncut diamondUncut diamond45–55 (noted)Rare193,500–236,500
Loop half of a keyLoop half of a key1Common19,735
Tooth half of a keyTooth half of a key1Common22,606
Uncut dragonstoneUncut dragonstone1Uncommon12,064
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare542,880–663,520
Dragon longswordDragon longsword1Common55,243
Dragon spearDragon spear1Rare37,295
BattlestaffBattlestaff180–220 (noted)Rare1,243,440–1,519,760
Rune javelinRune javelin5Rare895
Rune platebodyRune platebody1Uncommon36,844
Rune platebodyRune platebody15–25 (noted)Rare552,660–921,100
Shield left halfShield left half1Rare64,949
Dragon helmDragon helm1Uncommon58,568
Rune arrowheads 5Rune arrowheads113–137Common21,583–26,167
Onyx bolts 5Onyx bolts135–165Very rare1,050,570–1,284,030
Chaos talismanChaos talisman1Rare1,590
Nature talismanNature talisman1Rare1,042
Water talismanWater talisman65–82 (noted)Rare379,600–478,880
Earth talismanEarth talisman65–82 (noted)Rare126,750–159,900
Fire talismanFire talisman25–35 (noted)Rare39,675–55,545
Raw lobsterRaw lobster135–165 (noted)Common15,795–19,305
Raw sharkRaw shark225–275 (noted)Uncommon258,975–316,525
Big bonesBig bones72–90 (noted)Uncommon26,856–33,570
Dragon bonesDragon bones180–220 (noted)Rare310,320–379,280
CoalCoal200–1,100 (noted)Uncommon35,600–195,800
Gold oreGold ore90–110 (noted)Common13,590–16,610
Adamantite oreAdamantite ore180–220 (noted)Uncommon230,580–281,820
Adamant barAdamant bar14–16 (noted)Common44,156–50,464
Adamant barAdamant bar135–165 (noted)Rare425,790–520,410
Runite oreRunite ore90–110 (noted)Rare975,150–1,191,850
Rune barRune bar(noted)Common41,892
Rune barRune bar45–55 (noted)Rare628,380–768,020
Grimy torstolGrimy torstol90–110 (noted)Uncommon408,960–499,840
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon309,870–378,730
Super restore (4)Super restore (4)45–55 (noted)Uncommon264,285–323,015
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon224,055–273,845
Lantadyme seed 5Lantadyme seed14–16Uncommon28,700–32,800
Dwarf weed seed 5Dwarf weed seed14–16Uncommon26,572–30,368
Magic seed 5Magic seed4Uncommon442,952
Palm tree seed 5Palm tree seed10Rare2,030,790
FlaxFlax450–550 (noted)Common5,400–6,600
Molten glassMolten glass45–55 (noted)Common15,570–19,030
Soft claySoft clay450–550 (noted)Uncommon175,500–214,500
Yew logsYew logs68–82Uncommon14,144–17,056
Yew logsYew logs675–825 (noted)Rare140,400–171,600
Teak plankTeak plank45–55 (noted)Uncommon39,645–48,455
Mahogany plankMahogany plank270–330 (noted)Rare656,100–801,900
Blurberry specialBlurberry special1Uncommon1,792
Vecna skullVecna skull1Very rare*67,590
Hazelmere's signet ringHazelmere's signet ring1Very rare*15,689,056
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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