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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 bones Big bones 1 1 Always 657

CharmsEdit

Charm drop percentages
No charms Gold charm Green charm Crimson charm Blue charm

87–88%

2–3%

1–2%

7–8%

0.5–0.8%

Represents 90% confidence range, based on a sample of 5,762 kills.
1 charm is dropped at a time.

Please add to the log (only if 50 or more creatures killed).


Weapons and ArmourEdit

  Item Quantity Rarity GE Market Price
Adamant chainbody Adamant chainbody 1 2 Common 2,376
Adamant sq shield Adamant sq shield 1 2 Common 1,781
Rune dagger Rune dagger 1 2 Common 4,358
Rune helm Rune helm 1 2 Common 10,706
Rune mace Rune mace 1 2 Common 7,721
Rune longsword Rune longsword 1 2 Common 18,273
Royal cape Royal cape 1 4 Rare 249

HerbsEdit

  Item Quantity Rarity GE Market Price
Grimy guam Grimy guam 1 3 Uncommon 937
Grimy marrentill Grimy marrentill 1 3 Uncommon 81
Grimy tarromin Grimy tarromin 1 3 Uncommon 34
Grimy harralander Grimy harralander 1 3 Uncommon 208
Grimy ranarr Grimy ranarr 1 4 Rare 3,179
Grimy irit Grimy irit 1 4 Rare 3,087
Grimy avantoe Grimy avantoe 1 4 Rare 4,798
Grimy kwuarm Grimy kwuarm 1 4 Rare 4,778
Grimy cadantine Grimy cadantine 1 5 Very rare 2,179
Grimy lantadyme Grimy lantadyme 1 5 Very rare 9,093
Grimy dwarf weed Grimy dwarf weed 1 5 Very rare 10,852

SeedsEdit

  Item Quantity Rarity GE Market Price
Fellstalk seed 5 Fellstalk seed [1] 2 3 Uncommon 1,526
Belladonna seed 5 Belladonna seed 1 4 Rare 89
Cactus seed 5 Cactus seed 1 4 Rare 20
Poison ivy seed 5 Poison ivy seed 1 4 Rare 4
Herb seed 5 Toadflax seed 1 3 Uncommon 2,278
Herb seed 5 Irit seed 1 4 Rare 335
Herb seed 5 Avantoe seed 1 4 Rare 2,771
Herb seed 5 Kwuarm seed 1 4 Rare 903
Herb seed 5 Snapdragon seed 1 5 Very rare 2,045
Herb seed 5 Cadantine seed 1 5 Very rare 839
Herb seed 5 Lantadyme seed 1 5 Very rare 34,066
Herb seed 5 Dwarf weed seed 1 5 Very rare 49,171
Herb seed 5 Torstol seed 1 5 Very rare 24,352
  1. ^ No anagogic ort is dropped along this drop.

Raw MaterialsEdit

  Item Quantity Rarity GE Market Price
Flax Flax 50 (noted) 2 Common 3,800
Runite ore Runite ore 1 3 Uncommon 11,307
Adamantite ore Adamantite ore 3 (noted) 2 Common 6,057
Royal dragonhide Royal dragonhide 1 3 Uncommon 5,632

OtherEdit

  Item Quantity Rarity GE Market Price
Coins 1000 Coins 5,000 2 Common Not sold
Saradomin brew (2) Saradomin brew (2) 1 2 Common 428
Shark Shark 2 2 Common 3,460
Blood rune Blood rune 50 2 Common 13,000
Long bone Long bone 1 4 Rare Not sold
Curved bone Curved bone 1 4 Rare Not sold
Clue scroll Clue scroll (hard) 1 4 Rare Not sold
Spirit sapphire Spirit sapphire 1 4 Rare Not sold
Spirit emerald Spirit emerald 1 4 Rare Not sold
Spirit ruby Spirit ruby 1 4 Rare Not sold
Court summons Court summons 1 5 Very rare Not sold
Ancient effigy Starved ancient effigy 1 5 Very rare Not 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 250 Coins 250 – 450; 3,000;
9,000; 10,000; 12,000
2 Common Not sold
Uncut sapphire Uncut sapphire 1 2 Common 1,434
Uncut emerald Uncut emerald 1 2 Common 2,772
Uncut ruby Uncut ruby 1 2 Common 3,643
Uncut diamond Uncut diamond 1 3 Uncommon 6,590
Loop half of a key Loop half of a key 1 3 Uncommon 19,005
Tooth half of a key Tooth half of a key 1 3 Uncommon 40,326
Uncut dragonstone Uncut dragonstone 1 4 Rare 15,867
Dragonstone Dragonstone 1 4 Rare 10,138
Dragon dagger Dragon dagger 1 3 Uncommon 16,300
Rune battleaxe Rune battleaxe 1 4 Rare 24,136
Rune javelin Rune javelin 5 4 Rare 900
Adamant javelin Adamant javelin 20 5 Very rare 1,200
Rune 2h sword Rune 2h sword 1 5 Very rare 37,522
Rune spear Rune spear 1 5 Very rare 11,387
Dragon spear Dragon spear 1 5 Very rare 36,336
Dragon dagger Dragon dagger 50 (noted) 5 Very rare 815,000
Rune sq shield Rune sq shield 1 5 Very rare 22,348
Rune kiteshield Rune kiteshield 1 5 Very rare 31,840
Shield left half Shield left half 1 5 Very rare 63,812
Dragon helm Dragon helm 1 5 Very rare 59,386
Adamant bolts 5 Adamant bolts 200 3 Uncommon 20,600
Onyx bolts 5 Onyx bolts 150 4 Rare 1,264,050
Rune arrow 5 Rune arrow 150–200, 500 4 Rare 21,600–72,000
Battlestaff Battlestaff 200 (noted) 4 Rare 1,635,800
Vecna skull Vecna skull 1 5 Very rare 90,593
Water talisman Water talisman 1 3 Uncommon 12,984
Earth talisman Earth talisman 25–35 (noted) 3 Uncommon 87,225–122,115
Fire talisman Fire talisman 25–35 (noted) 3 Uncommon 93,875–131,425
Chaos talisman Chaos talisman 1 3 Uncommon 984
Nature talisman Nature talisman 1 3 Uncommon 303
Pure essence Pure essence 500–15,000 (noted) 3 Uncommon 7,500–225,000
Nature rune Nature rune 20–80 4 Rare 5,640–22,560
Soul rune Soul rune 20 4 Rare 3,020
Law rune Law rune 45 4 Rare 11,880
Death rune Death rune 50, 121 4 Rare 6,950–16,819
Blood rune Blood rune 50 4 Rare 13,000
Raw swordfish Raw swordfish 125–250, 1,000 (noted) 3 Uncommon 52,750–422,000
Raw shark Raw shark 250–500 (noted) 3 Uncommon 441,000–882,000
Big bones Big bones 150–500 (noted) 3 Uncommon 98,550–328,500
Coal Coal 150–7,500 (noted) 3 Uncommon 34,200–1,710,000
Adamantite ore Adamantite ore 150–800 (noted) 3 Uncommon 302,850–1,615,200
Silver ore Silver ore 100 (noted) 4 Rare 10,600
Runite ore Runite ore 100 (noted) 4 Rare 1,130,700
Adamant bar Adamant bar 1,000–7,000 (noted) 4 Rare 3,215,000–22,505,000
Rune bar Rune bar 1, 50 (noted) 4 Rare 14,190–709,500
Clean toadflax Clean toadflax 25–250 (noted) 3 Uncommon 129,700–1,297,000
Clean snapdragon Clean snapdragon 30–120 (noted) 3 Uncommon 127,020–508,080
Clean torstol Clean torstol 10–100 (noted) 3 Uncommon 73,460–734,600
Watermelon seed 5 Watermelon seed 3 3 Uncommon 6,624
Yew seed 5 Yew seed 1–50 4 Rare 66,914–3,345,700
Magic seed 5 Magic seed 1–7 4 Rare 133,460–934,220
Palm tree seed 5 Palm tree seed 10 4 Rare 1,045,090
Herb seed 5 Snapdragon seed 1 4 Rare 2,045
Yew logs Yew logs 50–20,000 (noted) 4 Rare 20,000–8,000,000
Crystal triskelion fragment 1 Crystal triskelion fragment 1 1 5 Very rare Not sold
Crystal triskelion fragment 2 Crystal triskelion fragment 2 1 5 Very rare Not sold
Crystal triskelion fragment 3 Crystal triskelion fragment 3 1 5 Very rare Not sold
Brawling gloves (Melee) Brawling gloves (Melee) 1 5 Very rare Not sold
Brawling gloves (Magic) Brawling gloves (Magic) 1 5 Very rare Not sold
Brawling gloves (Ranged) Brawling gloves (Ranged) 1 5 Very rare Not sold
Brawling gloves (Agility) Brawling gloves (Agility) 1 5 Very rare Not sold
Brawling gloves (Cooking) Brawling gloves (Cooking) 1 5 Very rare Not sold
Brawling gloves (FM) Brawling gloves (FM) 1 5 Very rare Not sold
Brawling gloves (Fishing) Brawling gloves (Fishing) 1 5 Very rare Not sold
Brawling gloves (Hunter) Brawling gloves (Hunter) 1 5 Very rare Not sold
Brawling gloves (Mining) Brawling gloves (Mining) 1 5 Very rare Not sold
Brawling gloves (Prayer) Brawling gloves (Prayer) 1 5 Very rare Not sold
Brawling gloves (Smithing) Brawling gloves (Smithing) 1 5 Very rare Not sold
Brawling gloves (Thieving) Brawling gloves (Thieving) 1 5 Very rare Not sold
Brawling gloves (WC) Brawling gloves (WC) 1 5 Very rare Not 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 token Key token 1 4 Rare Not 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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