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Mature grotworm

Release date	22 May 2012 (Update)
Members?	Yes
Combat level	167
XP per kill	Unknown edit
Slayer level	1
Slayer XP	205
Assigned by	Turael or Spria, Mazchna or Achtryn, Chaeldar, Sumona, Vannaka, Duradel or Lapalok, Kuradal
Always drops	Big bones
Examine text	The final stage of a grotworm before its metamorphosis.
Combat stats LP Max hit 2000 164 (melee), 169 (magic) Attack Defence Ranged Magic Unknown Unknown Unknown Unknown Other Immune to Poison? Immune to Stun? No Unknown edit Attack Speed Speed 3 (Interval: 4.2 seconds) Aggressive? Poisonous? Yes No Attack styles Weakness Magic Melee Stab

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Mature grotworms can be found on the bottom level of the Grotworm Lair. They have slow, but extremely accurate, 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. As they are weak to crush and stab, the chaotic maul, goliath gloves, and chaotic rapier are good choices. Protect from Melee/Deflect Melee would work best for up-close fighting. An excellent alternative to prayer is to use Guthan's set to heal. Lower-level players are recommended to bring high healing food such as monkfish or sharks if Guthan's healing effect fails to occur. 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.

Some players may find it useful to bring runes to cast High Level Alchemy on the items dropped by the grotworms, as Adamant armour and weapons are common drops.

Drops

100% Drops

Item		Quantity	Rarity	GE Market Price
	Big bones	1	1 Always	449

Charms

Charm drop percentages

No charms
89–90%	3%	2%	5%	0.8–1%

Represents 90% confidence range, based on a sample of 32,043 kills.
1 charm is dropped at a time.

Please add to the log (only if 50 or more creatures killed).

Weapons

Item		Quantity	Rarity	GE Market Price
	Rune dagger	1	2 Common	4,357
	Rune mace	1	2 Common	8,095
	Rune longsword	1	2 Common	18,488
	Adamant scimitar	1	4 Rare	1,355
	Adamant battleaxe	1	5 Very rare	2,253
	Adamant 2h sword	1	5 Very rare	3,404

Armour

Item		Quantity	Rarity	GE Market Price
	Rune helm	1	2 Common	10,893
	Adamant chainbody	1	2 Common	2,366
	Adamant sq shield	1	2 Common	1,797
	Royal cape	1	4 Rare	167

Herbs

Item		Quantity	Rarity	GE Market Price
	Grimy guam	1	3 Uncommon	539
	Grimy harralander	1	3 Uncommon	652
	Grimy tarromin	1	3 Uncommon	249
	Grimy ranarr	1	3 Uncommon	2,160
	Grimy irit	1	3 Uncommon	1,743
	Grimy avantoe	1	3 Uncommon	4,128
	Grimy kwuarm	1	3 Uncommon	2,471
	Grimy dwarf weed	1	3 Uncommon	8,195
	Grimy marrentill	1	4 Rare	44
	Grimy cadantine	1	4 Rare	2,507
	Grimy lantadyme	1	4 Rare	7,850

Seeds

Item		Quantity	Rarity	GE Market Price
	Cactus seed	1	3 Uncommon	26
	Poison ivy seed	1	3 Uncommon	54
	Avantoe seed	1–2	3 Uncommon	1,890–3,780
	Dwarf weed seed	1	3 Uncommon	38,269
	Fellstalk seed	2	3 Uncommon	932
	Cadantine seed	1	3 Uncommon	2,354
	Irit seed	1	3 Uncommon	74
	Belladonna seed	1	3 Uncommon	33
	Toadflax seed	1	3 Uncommon	702
	Kwuarm seed	1	4 Rare	363
	Lantadyme seed	1	5 Very rare	34,922

Raw Materials

Item		Quantity	Rarity	GE Market Price
	Royal dragonhide	1	4 Rare	5,107
	Flax	50–100 (noted)	3 Uncommon	1,100–2,200
	Runite ore	1	3 Uncommon	10,419
	Adamantite ore	3 (noted)	3 Uncommon	4,554

Potions

Item		Quantity	Rarity	GE Market Price
	Saradomin brew (2)	1	2 Common	305

Other

Item		Quantity	Rarity	GE Market Price
	Coins	2,000, 3,000, 5,000, 7,000	2 Common	Not sold
	Shark	2	2 Common	1,698
	Anagogic ort	20	3 Uncommon	Not sold
	Blood rune	10,50	3 Uncommon	1,630–8,150
	Rune bar	1	3 Uncommon	13,002
	Law rune	45	4 Rare	8,100
	Long bone	1	4 Rare	Not sold
	Curved bone	1	4 Rare	Not sold
	Spin ticket	1	4 Rare	Not sold
	Clue scroll (hard)	1	4 Rare	Not sold
	Court summons	1	5 Very rare	Not sold
	Starved ancient effigy	1	5 Very rare	Not sold

Rare drop table drops

This monster drops items from the rare drop table.
The ring of wealth improves the chances if equipped but is not required to access the table.

Trivia

• 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.
• When attacking a Mature Grotworm with Melee, the player's head is completely covered by the Grotworm's mouth.
• Due to excessive botting, an update on 7 August 2012 removed several rune armor drops from the drop table of Mature Grotworms, replacing them with their adamant counterparts.