|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 651
- Represents 90% confidence range, based on a sample of 6,660 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 2,263 Adamant sq shield 1 Common 1,784 Rune dagger 1 Common 4,295 Rune helm 1 Common 10,572 Rune mace 1 Common 7,794 Rune longsword 1 Common 18,305 Royal cape 1 Rare 304
Item Quantity Rarity GE Market Price Grimy guam 1 Uncommon 639 Grimy marrentill 1 Uncommon 152 Grimy tarromin 1 Uncommon 44 Grimy harralander 1 Uncommon 148 Grimy ranarr 1 Rare 3,399 Grimy irit 1 Rare 2,581 Grimy avantoe 1 Rare 4,565 Grimy kwuarm 1 Rare 3,460 Grimy cadantine 1 Very rare 2,417 Grimy lantadyme 1 Very rare 9,329 Grimy dwarf weed 1 Very rare 9,348
Item Quantity Rarity GE Market Price Fellstalk seed  2 Common 2,078 Belladonna seed 1 Rare 59 Cactus seed 1 Rare 35 Poison ivy seed 1 Rare 8 Toadflax seed 1 Uncommon 1,494 Irit seed 1 Rare 235 Avantoe seed 1 Rare 2,978 Kwuarm seed 1 Rare 284 Snapdragon seed 1 Very rare 2,555 Cadantine seed 1 Very rare 800 Lantadyme seed 1 Very rare 40,551 Dwarf weed seed 1 Very rare 44,606 Torstol seed 1 Very rare 41,717
- ^ No anagogic ort is dropped along this drop.
Item Quantity Rarity GE Market Price Flax 50 (noted) Common 4,550 Runite ore 1 Common 10,612 Adamantite ore 3 (noted) Common 6,480 Royal dragonhide 1 Uncommon 5,745
Item Quantity Rarity GE Market Price Coins 5,000 Common Not sold Saradomin brew (2) 1 Common 680 Shark 2 Common 2,444 Blood rune 20 Common 7,300 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 200–350;3,000 Common Not sold Uncut sapphire 1 Common 1,323 Uncut emerald 1 Common 2,865 Uncut ruby 1 Common 3,437 Uncut diamond 1 Uncommon 5,788 Loop half of a key 1 Uncommon 30,445 Tooth half of a key 1 Uncommon 45,120 Uncut dragonstone 1 Rare 15,552 Dragonstone 1 Rare 10,564 Dragon dagger 1 Uncommon 16,393 Rune battleaxe 1 Rare 24,197 Rune javelin 5 Rare 850 Adamant javelin 20 Very rare 1,260 Rune 2h sword 1 Very rare 37,492 Rune spear 1 Very rare 11,458 Dragon spear 1 Very rare 36,374 Battlestaff 200 (noted) Rare 1,572,400 Rune sq shield 1 Very rare 22,197 Rune kiteshield 1 Very rare 31,639 Shield left half 1 Very rare 64,814 Dragon helm 1 Very rare 59,208 Adamant bolts 200 Uncommon 14,200 Onyx bolts 150 Rare 1,267,050 Rune arrow 150 Rare 22,650 Vecna skull 1 Very rare 101,975 Water talisman 1 Uncommon 16,616 Earth talisman 25–35 (noted) Uncommon 133,900–187,460 Fire talisman 25–35 (noted) Uncommon 126,900–177,660 Chaos talisman 1 Uncommon 991 Nature talisman 1 Uncommon 346 Pure essence 1,000–1,500 (noted) Uncommon 15,000–22,500 Nature rune 60–80 Rare 17,460–23,280 Soul rune 20 Rare 4,420 Law rune 45 Rare 23,760 Death rune 50 Rare 13,350 Blood rune 50 Rare 18,250 Raw swordfish 125–250 (noted) Uncommon 50,250–100,500 Raw shark 250 (noted) Uncommon 366,250 Big bones 150–180 (noted) Uncommon 97,650–117,180 Coal 550–700 (noted) Uncommon 132,000–168,000 Adamantite ore 150–250 (noted) Uncommon 324,000–540,000 Silver ore 100 (noted) Rare 9,000 Runite ore 100 (noted) Rare 1,061,200 Rune bar 1 Common 13,675 Rune bar 50 (noted) Very rare 683,750 Clean toadflax 35–45 (noted) Uncommon 155,505–199,935 Clean snapdragon 30–35 (noted) Uncommon 141,060–164,570 Clean torstol 16–34 (noted) Uncommon 142,912–303,688 Snapdragon seed 1 Common 2,555 Torstol seed 1 Uncommon 41,717 Watermelon seed 3 Uncommon 7,023 Magic seed 3–7 Rare 427,980–998,620 Palm tree seed 10 Rare 1,101,940 Yew logs 450–550 (noted) Rare 175,500–214,500 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.