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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 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.

Money makingEdit

Killing mature grotworms
ProfitSkill requirementsOther requirementsExperience
Coins 1000 670,299

80 Magic-icon or Ranged-icon or Attack-icon recommended
55 Magic-icon for High Level Alchemy
80 Defence-icon recommended
50 Agility-icon recommended

Song from the Depths recommended 120,000 Multicombat
33,000 Constitution-icon
40,000 Magic-icon


DropsEdit

100% dropEdit

  Item Quantity Rarity GE Market Price
Big bones Big bones 1 1 Always 614

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 5,695 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 2,365
Adamant sq shield Adamant sq shield 1 2 Common 1,689
Rune dagger Rune dagger 1 2 Common 4,246
Rune helm Rune helm 1 2 Common 10,641
Rune mace Rune mace 1 2 Common 7,854
Rune longsword Rune longsword 1 2 Common 18,307
Royal cape Royal cape 1 4 Rare 149

HerbsEdit

  Item Quantity Rarity GE Market Price
Grimy guam Grimy guam 1 3 Uncommon 741
Grimy marrentill Grimy marrentill 1 3 Uncommon 72
Grimy tarromin Grimy tarromin 1 3 Uncommon 36
Grimy harralander Grimy harralander 1 3 Uncommon 183
Grimy ranarr Grimy ranarr 1 4 Rare 3,235
Grimy irit Grimy irit 1 4 Rare 2,685
Grimy avantoe Grimy avantoe 1 4 Rare 4,633
Grimy kwuarm Grimy kwuarm 1 4 Rare 4,476
Grimy cadantine Grimy cadantine 1 5 Very rare 1,695
Grimy lantadyme Grimy lantadyme 1 5 Very rare 10,139
Grimy dwarf weed Grimy dwarf weed 1 5 Very rare 12,534

SeedsEdit

  Item Quantity Rarity GE Market Price
Fellstalk seed 5 Fellstalk seed [1] 2 3 Uncommon 2,352
Belladonna seed 5 Belladonna seed 1 4 Rare 97
Cactus seed 5 Cactus seed 1 4 Rare 34
Poison ivy seed 5 Poison ivy seed 1 4 Rare 3
Herb seed 5 Toadflax seed 1 3 Uncommon 1,876
Herb seed 5 Irit seed 1 4 Rare 344
Herb seed 5 Avantoe seed 1 4 Rare 3,692
Herb seed 5 Kwuarm seed 1 4 Rare 1,436
Herb seed 5 Snapdragon seed 1 5 Very rare 2,425
Herb seed 5 Cadantine seed 1 5 Very rare 966
Herb seed 5 Lantadyme seed 1 5 Very rare 43,402
Herb seed 5 Dwarf weed seed 1 5 Very rare 66,144
Herb seed 5 Torstol seed 1 5 Very rare 25,317
  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 2 Common 11,852
Adamantite ore Adamantite ore 3 (noted) 2 Common 7,335
Royal dragonhide Royal dragonhide 1 3 Uncommon 5,699

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 425
Shark Shark 2 2 Common 2,722
Blood rune Blood rune 50 2 Common 15,700
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 1,498
Uncut emerald Uncut emerald 1 2 Common 3,035
Uncut ruby Uncut ruby 1 2 Common 3,586
Uncut diamond Uncut diamond 1 3 Uncommon 7,427
Loop half of a key Loop half of a key 1 3 Uncommon 18,544
Tooth half of a key Tooth half of a key 1 3 Uncommon 42,254
Uncut dragonstone Uncut dragonstone 1 4 Rare 15,600
Dragonstone Dragonstone 1 4 Rare 10,551
Dragon dagger Dragon dagger 1 3 Uncommon 15,835
Rune battleaxe Rune battleaxe 1 4 Rare 24,260
Rune javelin Rune javelin 5 4 Rare 865
Adamant javelin Adamant javelin 20 5 Very rare 1,160
Rune 2h sword Rune 2h sword 1 5 Very rare 37,179
Rune spear Rune spear 1 5 Very rare 11,439
Dragon spear Dragon spear 1 5 Very rare 35,969
Dragon dagger Dragon dagger 50 (noted) 5 Very rare 791,750
Rune sq shield Rune sq shield 1 5 Very rare 22,275
Rune kiteshield Rune kiteshield 1 5 Very rare 31,737
Shield left half Shield left half 1 5 Very rare 64,381
Dragon helm Dragon helm 1 5 Very rare 58,739
Adamant bolts 5 Adamant bolts 200 3 Uncommon 19,400
Onyx bolts 5 Onyx bolts 150 4 Rare 1,268,250
Rune arrow 5 Rune arrow 150–200, 500 4 Rare 22,200–74,000
Battlestaff Battlestaff 200 (noted) 4 Rare 1,621,800
Air orb Air orb 1,000 (noted) 4 Rare 2,565,000
Fire orb Fire orb 1,000 (noted) 4 Rare 2,135,000
Vecna skull Vecna skull 1 5 Very rare 100,064
Water talisman Water talisman 1 3 Uncommon 13,268
Earth talisman Earth talisman 25–35 (noted) 3 Uncommon 81,725–114,415
Fire talisman Fire talisman 25–35 (noted) 3 Uncommon 80,025–112,035
Chaos talisman Chaos talisman 1 3 Uncommon 1,054
Nature talisman Nature talisman 1 3 Uncommon 372
Pure essence Pure essence 500–15,000 (noted) 3 Uncommon 9,500–285,000
Nature rune Nature rune 20–80 4 Rare 6,080–24,320
Soul rune Soul rune 20 4 Rare 3,200
Law rune Law rune 45 4 Rare 14,535
Death rune Death rune 50, 121 4 Rare 8,450–20,449
Blood rune Blood rune 50 4 Rare 15,700
Raw swordfish Raw swordfish 125–250, 1,000 (noted) 3 Uncommon 47,500–380,000
Raw shark Raw shark 250–500 (noted) 3 Uncommon 369,000–738,000
Big bones Big bones 150–500 (noted) 3 Uncommon 92,100–307,000
Coal Coal 150–7,500 (noted) 3 Uncommon 33,600–1,680,000
Adamantite ore Adamantite ore 150–800 (noted) 3 Uncommon 366,750–1,956,000
Silver ore Silver ore 100 (noted) 4 Rare 10,500
Runite ore Runite ore 100 (noted) 4 Rare 1,185,200
Adamant bar Adamant bar 1,000–7,000 (noted) 4 Rare 3,439,000–24,073,000
Rune bar Rune bar 1, 50, 150 (noted) 4 Rare 14,414–2,162,100
Clean ranarr Clean ranarr 33 (noted) 3 Uncommon 110,154
Clean toadflax Clean toadflax 25–250 (noted) 3 Uncommon 120,125–1,201,250
Clean snapdragon Clean snapdragon 30–120 (noted) 3 Uncommon 146,280–585,120
Clean torstol Clean torstol 10–100 (noted) 3 Uncommon 77,020–770,200
Saradomin brew (4) Saradomin brew (4) 250 (noted) 5 Very rare 211,750
Watermelon seed 5 Watermelon seed 3 3 Uncommon 6,360
Yew seed 5 Yew seed 1–50 4 Rare 68,499–3,424,950
Magic seed 5 Magic seed 1–7 4 Rare 161,158–1,128,106
Palm tree seed 5 Palm tree seed 10 4 Rare 1,074,350
Herb seed 5 Snapdragon seed 1 4 Rare 2,425
Herb seed 5 Torstol seed 1–31 4 Rare 25,317–784,827
Fellstalk seed 5 Fellstalk seed 2 4 Rare 2,352
Yew logs Yew logs 50–20,000 (noted) 4 Rare 24,950–9,980,000
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 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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