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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).
This article has a money making guide here.
This article has a related strategy guide here.
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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 and cockroach soldiers. 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.

DropsEdit

100% dropEdit

Item Quantity Rarity GE market price
Big bonesBig bones1Always476

CharmsEdit

Charm drop numbers
No charmGold charmGreen charmCrimson charmBlue charm
87–88%2–3%1–2%8–9%0.5–0.8%
Represents a 90% confidence range.
Based on a sample of 7,978 kills.
1 charm is dropped at a time.
Please add to the log.
(Only if 50 or more creatures are killed)

Weapons and ArmourEdit

Item Quantity Rarity GE market price
Adamant chainbodyAdamant chainbody1Common2,232
Adamant sq shieldAdamant sq shield1Common1,760
Rune daggerRune dagger1Common4,273
Rune helmRune helm1Common10,770
Rune maceRune mace1Common7,933
Rune longswordRune longsword1Common18,447
Royal capeRoyal cape1Rare289

HerbsEdit

Item Quantity Rarity GE market price
Grimy guamGrimy guam1Uncommon460
Grimy marrentillGrimy marrentill1Uncommon190
Grimy tarrominGrimy tarromin1Uncommon27
Grimy harralanderGrimy harralander1Uncommon115
Grimy ranarrGrimy ranarr1Rare3,465
Grimy iritGrimy irit1Rare2,631
Grimy avantoeGrimy avantoe1Rare5,302
Grimy kwuarmGrimy kwuarm1Rare6,799
Grimy cadantineGrimy cadantine1Very rare3,810
Grimy lantadymeGrimy lantadyme1Very rare7,966
Grimy dwarf weedGrimy dwarf weed1Very rare8,690

SeedsEdit

Item Quantity Rarity GE market price
Fellstalk seed 5Fellstalk seed [1]2Common622
Belladonna seed 5Belladonna seed1Rare123
Cactus seed 5Cactus seed1Rare70
Poison ivy seed 5Poison ivy seed1Rare12
Herb seed 5Toadflax seed1Uncommon538
Herb seed 5Irit seed1Rare107
Herb seed 5Avantoe seed1Rare1,063
Herb seed 5Kwuarm seed1Rare348
Herb seed 5Snapdragon seed1Very rare971
Herb seed 5Cadantine seed1Very rare461
Herb seed 5Lantadyme seed1Very rare18,124
Herb seed 5Dwarf weed seed1Very rare23,148
Herb seed 5Torstol seed1Very rare14,069
  1. ^ No anagogic ort is dropped along this drop.

Raw MaterialsEdit

Item Quantity Rarity GE market price
FlaxFlax50–100 (noted)Common3,300–6,600
Runite oreRunite ore1Common10,660
Adamantite oreAdamantite ore3 (noted)Common4,107
Royal dragonhideRoyal dragonhide1Uncommon5,178

OtherEdit

    
Item Quantity Rarity GE market price
Coins 1000Coins5,000CommonNot sold
Saradomin brew (2)Saradomin brew (2)1Common2,383
SharkShark2Common2,214
Blood runeBlood rune20Common9,780
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.
The ring of wealth is not required to access the table.
Show/hide rare drop table
Item Quantity Rarity GE market price
Coins 1000Coins50; 250–500; 3,000CommonNot sold
Uncut sapphireUncut sapphire1Common1,227
Uncut emeraldUncut emerald1Common2,246
Uncut rubyUncut ruby1Uncommon2,970
Uncut diamondUncut diamond1; 2; 45–55 (noted)Uncommon5,821–320,155
Loop half of a keyLoop half of a key1Uncommon24,851
Tooth half of a keyTooth half of a key1Uncommon38,960
Uncut dragonstoneUncut dragonstone1; 45–55 (noted)Uncommon14,214–781,770
Dragon longswordDragon longsword1Uncommon57,620
Dragon spearDragon spear1Uncommon36,195
BattlestaffBattlestaff180–220 (noted)Uncommon1,383,300–1,690,700
Rune javelinRune javelin5Rare910
Rune platebodyRune platebody1Uncommon37,932
Shield left halfShield left half1Uncommon64,818
Dragon helmDragon helm1Uncommon58,081
Rune arrowheads 5Rune arrowheads113–137Uncommon20,792–25,208
Onyx bolts 5Onyx bolts135–165Uncommon1,133,595–1,385,505
Vecna skullVecna skull1Uncommon69,778
Water talismanWater talisman65–82 (noted)Uncommon891,280–1,124,384
Earth talismanEarth talisman65–82 (noted)Uncommon299,000–377,200
Fire talismanFire talisman25–35 (noted)Uncommon104,000–145,600
Chaos talismanChaos talisman1Uncommon596
Nature talismanNature talisman1Uncommon291
Raw lobsterRaw lobster135–165 (noted)Uncommon44,955–54,945
Raw sharkRaw shark225–275 (noted)Uncommon257,850–315,150
Big bonesBig bones80–90 (noted)Uncommon38,080–42,840
Dragon bonesDragon bones180–220 (noted)Uncommon446,400–545,600
CoalCoal200–1,100 (noted)Uncommon63,200–347,600
Gold oreGold ore90–110 (noted)Uncommon19,800–24,200
Adamantite oreAdamantite ore180–220 (noted)Uncommon246,420–301,180
Adamant barAdamant bar15 (noted)Common43,695
Adamant barAdamant bar135–165 (noted)Rare393,255–480,645
Runite oreRunite ore90–110 (noted)Rare959,400–1,172,600
Rune barRune bar3 (noted)Common42,960
Rune barRune bar45–55 (noted)Rare644,400–787,600
Grimy torstolGrimy torstol90–110 (noted)Uncommon603,630–737,770
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon417,870–510,730
Super restore (4)Super restore (4)45–55 (noted)Uncommon250,695–306,405
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon171,090–209,110
Herb seed 5Lantadyme seed14–16Uncommon253,736–289,984
Herb seed 5Dwarf weed seed14–16Uncommon324,072–370,368
Magic seed 5Magic seed4Uncommon589,644
Palm tree seed 5Palm tree seed10Uncommon1,493,230
FlaxFlax450–550 (noted)Uncommon29,700–36,300
Molten glassMolten glass45–55 (noted)Uncommon11,250–13,750
Soft claySoft clay450–550 (noted)Uncommon108,450–132,550
Yew logsYew logs68–82; 675–825 (noted)Uncommon20,468–248,325
Teak plankTeak plank45–55 (noted)Uncommon41,715–50,985
Mahogany plankMahogany plank270–330 (noted)Uncommon655,290–800,910
Brawling gloves (Melee)Brawling gloves (Melee)1RareNot sold
Brawling gloves (Magic)Brawling gloves (Magic)1RareNot sold
Brawling gloves (Ranged)Brawling gloves (Ranged)1RareNot sold
Brawling gloves (Agility)Brawling gloves (Agility)1RareNot sold
Brawling gloves (Cooking)Brawling gloves (Cooking)1RareNot sold
Brawling gloves (FM)Brawling gloves (FM)1RareNot sold
Brawling gloves (Fishing)Brawling gloves (Fishing)1RareNot sold
Brawling gloves (Hunter)Brawling gloves (Hunter)1RareNot sold
Brawling gloves (Mining)Brawling gloves (Mining)1RareNot sold
Brawling gloves (Prayer)Brawling gloves (Prayer)1RareNot sold
Brawling gloves (Smithing)Brawling gloves (Smithing)1RareNot sold
Brawling gloves (Thieving)Brawling gloves (Thieving)1RareNot sold
Brawling gloves (WC)Brawling gloves (WC)1RareNot 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 market 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 lifepoints 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 lifepoints 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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