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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 bones1Always349

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 11,888 kills.
1 charm is dropped at a time.
Add data to the log (requires JavaScript).

Weapons and armourEdit

Item Quantity Rarity GE price
Adamant chainbodyAdamant chainbody1Common2,059
Adamant sq shieldAdamant sq shield1Common1,807
Rune daggerRune dagger1Common3,762
Rune helmRune helm1Common10,079
Rune maceRune mace1Common6,941
Rune longswordRune longsword1Uncommon17,776
Royal capeRoyal cape1Rare615

MaterialsEdit

Item Quantity Rarity GE price
Grimy guamGrimy guam1Uncommon182
Grimy marrentillGrimy marrentill1Uncommon208
Grimy tarrominGrimy tarromin1Uncommon34
Grimy harralanderGrimy harralander1Uncommon79
Grimy ranarrGrimy ranarr1Rare2,988
Grimy iritGrimy irit1Rare3,030
Grimy avantoeGrimy avantoe1Rare2,500
Grimy kwuarmGrimy kwuarm1Rare5,487
Grimy cadantineGrimy cadantine1Very rare5,204
Grimy lantadymeGrimy lantadyme1Very rare3,763
Grimy dwarf weedGrimy dwarf weed1Very rare2,999
Fellstalk seed 5Fellstalk seed2Common854
Belladonna seed 5Belladonna seed1Rare409
Cactus seed 5Cactus seed1Rare217
Poison ivy seed 5Poison ivy seed1Rare41
Toadflax seed 5Toadflax seed1Uncommon2,114
Irit seed 5Irit seed1Rare463
Avantoe seed 5Avantoe seed1Rare370
Kwuarm seed 5Kwuarm seed1Rare6,315
Snapdragon seed 5Snapdragon seed1Very rare744
Cadantine seed 5Cadantine seed1Very rare7,448
Lantadyme seed 5Lantadyme seed1Very rare1,404
Dwarf weed seed 5Dwarf weed seed1Very rare1,132
Torstol seed 5Torstol seed1Very rare3,420
FlaxFlax50–100 (noted)Common550–1,100
Runite oreRunite ore1Common10,842
Adamantite oreAdamantite ore(noted)Common3,213
Royal dragonhideRoyal dragonhide1Uncommon4,963

OtherEdit

    
Item Quantity Rarity GE price
Coins 1000Coins5,000Common5,000
Saradomin brew (2)Saradomin brew (2)1Common5,290
SharkShark2Common1,952
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, luck potion 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 sapphire1Common946
Uncut emeraldUncut emerald1Common1,973
Uncut rubyUncut ruby1Common2,604
Uncut diamondUncut diamond1Common4,088
Uncut diamondUncut diamond45–55 (noted)Rare183,960–224,840
Loop half of a keyLoop half of a key1Common17,899
Tooth half of a keyTooth half of a key1Common24,135
Uncut dragonstoneUncut dragonstone1Uncommon11,601
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare522,045–638,055
Dragon longswordDragon longsword1Common55,246
Dragon spearDragon spear1Rare35,946
BattlestaffBattlestaff180–220 (noted)Rare1,200,600–1,467,400
Rune javelinRune javelin5Rare930
Rune platebodyRune platebody1Uncommon37,373
Rune platebodyRune platebody15–25 (noted)Rare560,595–934,325
Shield left halfShield left half1Rare63,598
Dragon helmDragon helm1Uncommon58,205
Rune arrowheads 5Rune arrowheads113–137Common18,758–22,742
Onyx bolts 5Onyx bolts135–165Very rare1,034,235–1,264,065
Vecna skullVecna skull1Very rare59,537
Chaos talismanChaos talisman1Rare1,706
Nature talismanNature talisman1Rare1,021
Water talismanWater talisman65–82 (noted)Rare353,665–446,162
Earth talismanEarth talisman65–82 (noted)Rare111,735–140,958
Fire talismanFire talisman25–35 (noted)Rare35,625–49,875
Raw lobsterRaw lobster135–165 (noted)Common13,500–16,500
Raw sharkRaw shark225–275 (noted)Uncommon249,975–305,525
Big bonesBig bones72–90 (noted)Uncommon25,128–31,410
Dragon bonesDragon bones180–220 (noted)Rare308,700–377,300
CoalCoal200–1,100 (noted)Uncommon37,200–204,600
Gold oreGold ore90–110 (noted)Common12,420–15,180
Adamantite oreAdamantite ore180–220 (noted)Uncommon192,780–235,620
Adamant barAdamant bar14–16 (noted)Common34,160–39,040
Adamant barAdamant bar135–165 (noted)Rare329,400–402,600
Runite oreRunite ore90–110 (noted)Rare975,780–1,192,620
Rune barRune bar(noted)Common41,370
Rune barRune bar45–55 (noted)Rare620,550–758,450
Grimy torstolGrimy torstol90–110 (noted)Uncommon387,000–473,000
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon332,280–406,120
Super restore (4)Super restore (4)45–55 (noted)Uncommon254,160–310,640
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon211,320–258,280
Lantadyme seed 5Lantadyme seed14–16Uncommon19,656–22,464
Dwarf weed seed 5Dwarf weed seed14–16Uncommon15,848–18,112
Magic seed 5Magic seed4Uncommon519,652
Palm tree seed 5Palm tree seed10Rare2,101,410
FlaxFlax450–550 (noted)Common4,950–6,050
Molten glassMolten glass45–55 (noted)Common10,440–12,760
Soft claySoft clay450–550 (noted)Uncommon144,900–177,100
Yew logsYew logs68–82Uncommon13,736–16,564
Yew logsYew logs675–825 (noted)Rare136,350–166,650
Teak plankTeak plank45–55 (noted)Uncommon28,170–34,430
Mahogany plankMahogany plank270–330 (noted)Rare561,330–686,070
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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