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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 bones1Always335

CharmsEdit

No charmGold charmGreen charmCrimson charmBlue charm
87–88%3%1–2%8–9%0.4–0.7%
Represents a 90% confidence range.
Based on a sample of 11,116 kills.
1 charm is dropped at a time.
Add data to the log
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Weapons and armourEdit

Item Quantity Rarity GE price
Adamant chainbodyAdamant chainbody1Common2,381
Adamant sq shieldAdamant sq shield1Common3,871
Rune daggerRune dagger1Common3,922
Rune helmRune helm1Common10,361
Rune maceRune mace1Common7,028
Rune longswordRune longsword1Uncommon17,919
Royal capeRoyal cape1Rare607

MaterialsEdit

Item Quantity Rarity GE price
Grimy guamGrimy guam1Uncommon99
Grimy marrentillGrimy marrentill1Uncommon118
Grimy tarrominGrimy tarromin1Uncommon33
Grimy harralanderGrimy harralander1Uncommon74
Grimy ranarrGrimy ranarr1Rare2,660
Grimy iritGrimy irit1Rare3,504
Grimy avantoeGrimy avantoe1Rare3,753
Grimy kwuarmGrimy kwuarm1Rare6,125
Grimy cadantineGrimy cadantine1Very rare6,170
Grimy lantadymeGrimy lantadyme1Very rare4,660
Grimy dwarf weedGrimy dwarf weed1Very rare4,409
Fellstalk seed 5Fellstalk seed2Common914
Belladonna seed 5Belladonna seed1Rare383
Cactus seed 5Cactus seed1Rare226
Poison ivy seed 5Poison ivy seed1Rare64
Toadflax seed 5Toadflax seed1Uncommon685
Irit seed 5Irit seed1Rare308
Avantoe seed 5Avantoe seed1Rare296
Kwuarm seed 5Kwuarm seed1Rare5,385
Snapdragon seed 5Snapdragon seed1Very rare484
Cadantine seed 5Cadantine seed1Very rare7,203
Lantadyme seed 5Lantadyme seed1Very rare1,018
Dwarf weed seed 5Dwarf weed seed1Very rare1,053
Torstol seed 5Torstol seed1Very rare2,890
FlaxFlax50–100 (noted)Common650–1,300
Runite oreRunite ore1Common11,158
Adamantite oreAdamantite ore(noted)Common3,285
Royal dragonhideRoyal dragonhide1Uncommon6,134

OtherEdit

    
Item Quantity Rarity GE price
Coins 1000Coins5,000Common5,000
Saradomin brew (2)Saradomin brew (2)1Common6,055
SharkShark2Common1,932
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.
A ring of wealth or collector's insignia 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 sapphire1Common1,141
Uncut emeraldUncut emerald1Common2,099
Uncut rubyUncut ruby1Common3,664
Uncut diamondUncut diamond1Common4,812
Uncut diamondUncut diamond45–55 (noted)Rare216,540–264,660
Loop half of a keyLoop half of a key1Common17,525
Tooth half of a keyTooth half of a key1Common28,477
Uncut dragonstoneUncut dragonstone1Uncommon14,212
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare639,540–781,660
Dragon longswordDragon longsword1Common56,909
Dragon spearDragon spear1Rare35,682
BattlestaffBattlestaff180–220 (noted)Rare1,266,840–1,548,360
Rune javelinRune javelin5Rare965
Rune platebodyRune platebody1Uncommon37,116
Rune platebodyRune platebody15–25 (noted)Rare556,740–927,900
Shield left halfShield left half1Rare63,545
Dragon helmDragon helm1Uncommon58,132
Rune arrowheads 5Rune arrowheads113–137Common20,792–25,208
Onyx bolts 5Onyx bolts135–165Very rare1,062,990–1,299,210
Vecna skullVecna skull1Rare76,528
Chaos talismanChaos talisman1Rare1,377
Nature talismanNature talisman1Rare875
Water talismanWater talisman65–82 (noted)Rare503,295–634,926
Earth talismanEarth talisman65–82 (noted)Rare163,670–206,476
Fire talismanFire talisman25–35 (noted)Rare60,325–84,455
Raw lobsterRaw lobster135–165 (noted)Common13,770–16,830
Raw sharkRaw shark225–275 (noted)Uncommon261,225–319,275
Big bonesBig bones76–90 (noted)Uncommon25,460–30,150
Dragon bonesDragon bones180–220 (noted)Rare342,360–418,440
CoalCoal200–1,100 (noted)Uncommon36,400–200,200
Gold oreGold ore90–110 (noted)Common12,780–15,620
Adamantite oreAdamantite ore180–220 (noted)Uncommon197,100–240,900
Adamant barAdamant bar14–16 (noted)Common41,314–47,216
Adamant barAdamant bar135–165 (noted)Rare398,385–486,915
Runite oreRunite ore90–110 (noted)Rare1,004,220–1,227,380
Rune barRune bar(noted)Common42,393
Rune barRune bar45–55 (noted)Rare635,895–777,205
Grimy torstolGrimy torstol90–110 (noted)Uncommon507,780–620,620
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon357,930–437,470
Super restore (4)Super restore (4)45–55 (noted)Uncommon274,635–335,665
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon154,710–189,090
Lantadyme seed 5Lantadyme seed14–16Uncommon14,252–16,288
Dwarf weed seed 5Dwarf weed seed14–16Uncommon14,742–16,848
Magic seed 5Magic seed4Uncommon313,008
Palm tree seed 5Palm tree seed10Rare1,325,490
FlaxFlax450–550 (noted)Common5,850–7,150
Molten glassMolten glass45–55 (noted)Common13,230–16,170
Soft claySoft clay450–550 (noted)Uncommon197,100–240,900
Yew logsYew logs68–82Uncommon12,580–15,170
Yew logsYew logs675–825 (noted)Rare124,875–152,625
Teak plankTeak plank45–55 (noted)Uncommon43,245–52,855
Mahogany plankMahogany plank270–330 (noted)Rare683,370–835,230
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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