|Release date||22 May 2012 (Update)|
|Combat level|| 98|
|XP per kill||661 (and 218.1 experience)|
|Always drops||Big bones|
|Examine text||The final stage of a grotworm before its metamorphosis.|
|Assigned by||Turael or Spria, Mazchna or Achtryn, Chaeldar, Sumona, Vannaka, Duradel or Lapalok, Kuradal|
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.
Item Quantity Rarity GE Market Price Big bones 1 Always 708
- Represents 90% confidence range, based on a sample of 6,001 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 1 Common 2,262 Adamant sq shield 1 Common 1,768 Rune dagger 1 Common 4,199 Rune helm 1 Common 10,703 Rune mace 1 Common 7,878 Rune longsword 1 Common 18,216 Royal cape 1 Rare 309
Item Quantity Rarity GE Market Price Grimy guam 1 Uncommon 728 Grimy marrentill 1 Uncommon 125 Grimy tarromin 1 Uncommon 40 Grimy harralander 1 Uncommon 148 Grimy ranarr 1 Rare 2,843 Grimy irit 1 Rare 2,601 Grimy avantoe 1 Rare 4,311 Grimy kwuarm 1 Rare 4,029 Grimy cadantine 1 Very rare 1,990 Grimy lantadyme 1 Very rare 9,277 Grimy dwarf weed 1 Very rare 9,513
Item Quantity Rarity GE Market Price Fellstalk seed  2 Common 2,080 Belladonna seed 1 Rare 79 Cactus seed 1 Rare 21 Poison ivy seed 1 Rare 6 Toadflax seed 1 Uncommon 3,165 Irit seed 1 Rare 224 Avantoe seed 1 Rare 2,199 Kwuarm seed 1 Rare 1,066 Snapdragon seed 1 Very rare 1,514 Cadantine seed 1 Very rare 906 Lantadyme seed 1 Very rare 34,262 Dwarf weed seed 1 Very rare 43,287 Torstol seed 1 Very rare 35,245
- ^ No anagogic ort is dropped along this drop.
Item Quantity Rarity GE Market Price Flax 50 (noted) Common 4,300 Runite ore 1 Common 11,455 Adamantite ore 3 (noted) Common 6,093 Royal dragonhide 1 Uncommon 5,809
Item Quantity Rarity GE Market Price Coins 5,000 Common Not sold Saradomin brew (2) 1 Common 670 Shark 2 Common 3,156 Blood rune 20 Common 6,400 Long bone 1 Rare Not sold Curved bone 1 Rare Not sold Clue scroll (hard) 1 Rare Not sold Spirit sapphire 1 Rare Not sold Spirit emerald 1 Rare Not sold Spirit ruby 1 Rare Not sold Court summons 1 Very rare Not sold Starved ancient effigy 1 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 – 450; 3,000;
9,000; 10,000; 12,000
Common Not sold Uncut sapphire 1 Common 1,462 Uncut emerald 1 Common 2,726 Uncut ruby 1 Common 3,819 Uncut diamond 1 Uncommon 6,238 Loop half of a key 1 Uncommon 17,339 Tooth half of a key 1 Uncommon 38,320 Uncut dragonstone 1 Rare 15,219 Dragonstone 1 Rare 10,390 Dragon dagger 1 Uncommon 16,551 Rune battleaxe 1 Rare 24,216 Rune javelin 5 Rare 860 Adamant javelin 20 Very rare 1,220 Rune 2h sword 1 Very rare 37,549 Rune spear 1 Very rare 11,389 Dragon spear 1 Very rare 36,411 Dragon dagger 50 (noted) Very rare 827,550 Rune sq shield 1 Very rare 22,253 Rune kiteshield 1 Very rare 31,727 Shield left half 1 Very rare 64,266 Dragon helm 1 Very rare 59,252 Adamant bolts 200 Uncommon 12,800 Onyx bolts 150 Rare 1,254,300 Rune arrow 150–200, 500 Rare 22,650–75,500 Battlestaff 200 (noted) Rare 1,598,000 Vecna skull 1 Very rare 104,649 Water talisman 1 Uncommon 12,616 Earth talisman 25–35 (noted) Uncommon 69,275–96,985 Fire talisman 25–35 (noted) Uncommon 69,450–97,230 Chaos talisman 1 Uncommon 968 Nature talisman 1 Uncommon 368 Pure essence 500–15,000 (noted) Uncommon 9,500–285,000 Nature rune 20–80 Rare 5,600–22,400 Soul rune 20 Rare 4,880 Law rune 45 Rare 14,490 Death rune 50, 121 Rare 10,150–24,563 Blood rune 50 Rare 16,000 Raw swordfish 125–250, 1,000 (noted) Uncommon 51,250–410,000 Raw shark 250–500 (noted) Uncommon 472,000–944,000 Big bones 150–500 (noted) Uncommon 106,200–354,000 Coal 150–7,500 (noted) Uncommon 41,250–2,062,500 Adamantite ore 150–800 (noted) Uncommon 304,650–1,624,800 Silver ore 100 (noted) Rare 8,800 Runite ore 100 (noted) Rare 1,145,500 Adamant bar 1,000–7,000 (noted) Rare 3,531,000–24,717,000 Rune bar 1, 50 (noted) Rare 14,436–721,800 Clean toadflax 25–250 (noted) Uncommon 132,550–1,325,500 Clean snapdragon 30–120 (noted) Uncommon 136,950–547,800 Clean torstol 10–100 (noted) Uncommon 89,170–891,700 Watermelon seed 3 Uncommon 8,130 Yew seed 1–50 Rare 68,298–3,414,900 Magic seed 1–7 Rare 139,158–974,106 Palm tree seed 10 Rare 1,367,180 Snapdragon seed 1 Rare 1,514 Yew logs 50–20,000 (noted) Rare 20,750–8,300,000 Crystal triskelion fragment 1 1 Very rare Not sold Crystal triskelion fragment 2 1 Very rare Not sold Crystal triskelion fragment 3 1 Very rare Not sold Brawling gloves (Melee) 1 Very rare Not sold Brawling gloves (Magic) 1 Very rare Not sold Brawling gloves (Ranged) 1 Very rare Not sold Brawling gloves (Agility) 1 Very rare Not sold Brawling gloves (Cooking) 1 Very rare Not sold Brawling gloves (FM) 1 Very rare Not sold Brawling gloves (Fishing) 1 Very rare Not sold Brawling gloves (Hunter) 1 Very rare Not sold Brawling gloves (Mining) 1 Very rare Not sold Brawling gloves (Prayer) 1 Very rare Not sold Brawling gloves (Smithing) 1 Very rare Not sold Brawling gloves (Thieving) 1 Very rare Not sold Brawling gloves (WC) 1 Very rare Not sold
- 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 1 Rare Not sold
- 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.