|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 543
- Represents 90% confidence range, based on a sample of 7,267 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 2,269 Adamant sq shield 1 Common 1,731 Rune dagger 1 Common 4,171 Rune helm 1 Common 10,563 Rune mace 1 Common 7,772 Rune longsword 1 Common 18,327 Royal cape 1 Rare 399
Item Quantity Rarity GE market price Grimy guam 1 Uncommon 410 Grimy marrentill 1 Uncommon 135 Grimy tarromin 1 Uncommon 35 Grimy harralander 1 Uncommon 84 Grimy ranarr 1 Rare 2,584 Grimy irit 1 Rare 2,099 Grimy avantoe 1 Rare 3,932 Grimy kwuarm 1 Rare 3,768 Grimy cadantine 1 Very rare 1,959 Grimy lantadyme 1 Very rare 6,777 Grimy dwarf weed 1 Very rare 6,947
Item Quantity Rarity GE market price Fellstalk seed  2 Common 842 Belladonna seed 1 Rare 100 Cactus seed 1 Rare 43 Poison ivy seed 1 Rare 10 Toadflax seed 1 Uncommon 636 Irit seed 1 Rare 153 Avantoe seed 1 Rare 1,298 Kwuarm seed 1 Rare 118 Snapdragon seed 1 Very rare 1,373 Cadantine seed 1 Very rare 490 Lantadyme seed 1 Very rare 23,933 Dwarf weed seed 1 Very rare 26,562 Torstol seed 1 Very rare 16,604
- ^ No anagogic ort is dropped along this drop.
Item Quantity Rarity GE market price Flax 50 (noted) Common 5,050 Runite ore 1 Common 10,774 Adamantite ore 3 (noted) Common 4,047 Royal dragonhide 1 Uncommon 5,277
Item Quantity Rarity GE market price Coins 5,000 Common Not sold Saradomin brew (2) 1 Common 802 Shark 2 Common 1,990 Blood rune 20 Common 10,020 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 1,119 Uncut emerald 1 Common 2,054 Uncut ruby 1 Common 2,984 Uncut diamond 1 Uncommon 5,025 Loop half of a key 1 Uncommon 27,273 Tooth half of a key 1 Uncommon 30,335 Uncut dragonstone 1 Rare 13,129 Dragonstone 1 Rare 9,992 Dragon dagger 1 Uncommon 16,533 Rune battleaxe 1 Rare 24,241 Rune javelin 5 Rare 890 Adamant javelin 20 Very rare 1,240 Rune 2h sword 1 Very rare 37,203 Rune spear 1 Very rare 11,423 Dragon spear 1 Very rare 36,909 Battlestaff 200 (noted) Rare 1,575,000 Rune sq shield 1 Very rare 22,019 Rune kiteshield 1 Very rare 31,800 Shield left half 1 Very rare 64,586 Dragon helm 1 Very rare 59,154 Adamant bolts 200 Uncommon 12,000 Onyx bolts 150 Rare 1,257,600 Rune arrow 150 Rare 22,650 Vecna skull 1 Very rare 94,419 Water talisman 1 Uncommon 10,858 Earth talisman 25–35 (noted) Uncommon 66,100–92,540 Fire talisman 25–35 (noted) Uncommon 64,225–89,915 Chaos talisman 1 Uncommon 555 Nature talisman 1 Uncommon 387 Pure essence 1,000–1,500 (noted) Uncommon 15,000–22,500 Nature rune 60–80 Rare 21,480–28,640 Soul rune 20 Rare 4,200 Law rune 45 Rare 19,305 Death rune 50 Rare 17,750 Blood rune 50 Rare 25,050 Raw swordfish 125–250 (noted) Uncommon 54,875–109,750 Raw shark 250 (noted) Uncommon 290,500 Big bones 150–180 (noted) Uncommon 81,450–97,740 Coal 550–700 (noted) Uncommon 148,500–189,000 Adamantite ore 150–250 (noted) Uncommon 202,350–337,250 Silver ore 100 (noted) Rare 8,900 Runite ore 100 (noted) Rare 1,077,400 Rune bar 1 Common 14,230 Rune bar 50 (noted) Very rare 711,500 Clean toadflax 35–45 (noted) Uncommon 119,875–154,125 Clean snapdragon 30–35 (noted) Uncommon 112,470–131,215 Clean torstol 16–34 (noted) Uncommon 90,608–192,542 Snapdragon seed 1 Common 1,373 Torstol seed 1 Uncommon 16,604 Watermelon seed 3 Uncommon 7,296 Magic seed 3–7 Rare 504,669–1,177,561 Palm tree seed 10 Rare 1,619,220 Yew logs 450–550 (noted) Rare 162,450–198,550 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.