|Release date||22 May 2012 (Update)|
|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, Morvran|
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 665
- Represents 90% confidence range, based on a sample of 6,084 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 2,309 Adamant sq shield 1 Common 1,762 Rune dagger 1 Common 4,189 Rune helm 1 Common 10,573 Rune mace 1 Common 7,849 Rune longsword 1 Common 18,475 Royal cape 1 Rare 311
Item Quantity Rarity GE Market Price Grimy guam 1 Uncommon 697 Grimy marrentill 1 Uncommon 192 Grimy tarromin 1 Uncommon 38 Grimy harralander 1 Uncommon 160 Grimy ranarr 1 Rare 2,896 Grimy irit 1 Rare 2,748 Grimy avantoe 1 Rare 4,270 Grimy kwuarm 1 Rare 3,651 Grimy cadantine 1 Very rare 2,141 Grimy lantadyme 1 Very rare 8,916 Grimy dwarf weed 1 Very rare 8,931
Item Quantity Rarity GE Market Price Fellstalk seed  2 Common 2,096 Belladonna seed 1 Rare 62 Cactus seed 1 Rare 29 Poison ivy seed 1 Rare 8 Toadflax seed 1 Uncommon 2,321 Irit seed 1 Rare 268 Avantoe seed 1 Rare 2,847 Kwuarm seed 1 Rare 655 Snapdragon seed 1 Very rare 2,102 Cadantine seed 1 Very rare 933 Lantadyme seed 1 Very rare 39,184 Dwarf weed seed 1 Very rare 43,589 Torstol seed 1 Very rare 39,030
- ^ No anagogic ort is dropped along this drop.
Item Quantity Rarity GE Market Price Flax 50 (noted) Common 5,050 Runite ore 1 Common 10,491 Adamantite ore 3 (noted) Common 6,936 Royal dragonhide 1 Uncommon 5,481
Item Quantity Rarity GE Market Price Coins 5,000 Common Not sold Saradomin brew (2) 1 Common 637 Shark 2 Common 2,930 Blood rune 20 Common 6,340 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 1,332 Uncut emerald 1 Common 2,723 Uncut ruby 1 Common 3,503 Uncut diamond 1 Uncommon 6,046 Loop half of a key 1 Uncommon 26,917 Tooth half of a key 1 Uncommon 59,980 Uncut dragonstone 1 Rare 15,366 Dragonstone 1 Rare 10,461 Dragon dagger 1 Uncommon 16,148 Rune battleaxe 1 Rare 24,176 Rune javelin 5 Rare 875 Adamant javelin 20 Very rare 1,220 Rune 2h sword 1 Very rare 37,509 Rune spear 1 Very rare 11,448 Dragon spear 1 Very rare 36,048 Dragon dagger 50 (noted) Very rare 807,400 Rune sq shield 1 Very rare 22,359 Rune kiteshield 1 Very rare 31,375 Shield left half 1 Very rare 64,022 Dragon helm 1 Very rare 58,997 Adamant bolts 200 Uncommon 18,800 Onyx bolts 150 Rare 1,258,200 Rune arrow 150–200, 500 Rare 22,800–76,000 Battlestaff 200 (noted) Rare 1,564,200 Vecna skull 1 Very rare 102,171 Water talisman 1 Uncommon 15,630 Earth talisman 25–35 (noted) Uncommon 116,600–163,240 Fire talisman 25–35 (noted) Uncommon 112,300–157,220 Chaos talisman 1 Uncommon 978 Nature talisman 1 Uncommon 375 Pure essence 500–15,000 (noted) Uncommon 8,000–240,000 Nature rune 20–80 Rare 5,820–23,280 Soul rune 20 Rare 4,860 Law rune 45 Rare 20,880 Death rune 50, 121 Rare 10,750–26,015 Blood rune 50 Rare 15,850 Raw swordfish 125–250, 1,000 (noted) Uncommon 49,375–395,000 Raw shark 250–500 (noted) Uncommon 387,500–775,000 Big bones 150–500 (noted) Uncommon 99,750–332,500 Coal 150–7,500 (noted) Uncommon 36,450–1,822,500 Adamantite ore 150–800 (noted) Uncommon 346,800–1,849,600 Silver ore 100 (noted) Rare 9,300 Runite ore 100 (noted) Rare 1,049,100 Adamant bar 1,000–7,000 (noted) Rare 3,061,000–21,427,000 Rune bar 1, 50 (noted) Rare 13,926–696,300 Clean toadflax 25–250 (noted) Uncommon 109,425–1,094,250 Clean snapdragon 30–120 (noted) Uncommon 147,660–590,640 Clean torstol 10–100 (noted) Uncommon 86,180–861,800 Watermelon seed 3 Uncommon 8,547 Yew seed 1–50 Rare 65,199–3,259,950 Magic seed 1–7 Rare 141,110–987,770 Palm tree seed 10 Rare 1,152,270 Snapdragon seed 1 Rare 2,102 Yew logs 50–20,000 (noted) Rare 19,600–7,840,000 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.