Mature grotworm

This article is about level 98 Grotworms. For other types of Grotworms, see Grotworm (disambiguation).

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This article has a strategy guide. All information on mechanics, setups, and strategy are on the subpage.

Mature grotworm

Release	22 May 2012 (Update)
Members	Yes
Examine
The final stage of a grotworm before its metamorphosis.
Combat info
Level	LP	XP	XP
98	10,500	661	218.1
Equipment XP (2H/MH & Armour/OH)
39 / 26 / 13
Aggressive		Poisonous
Slayer
Level	XP	Category
1	343.6	Grotworms
Assigned by
Offensive
Max hit
672	0	672	0
Style		Speed
		7 ticks (4.2s)
Combat levels
70 1 70 Accuracy 1486 0 1486
Defensive
Armour		Weakness
1694	70
Affinities
90	45	65	55
Immunities

Defined properties:

All Life points: 10,500 Life points: 10,500 All Slayer experience: 343.6 Slayer experience: 343.6 All Combat experience: 661 Combat experience: 661 All Release date: 22 May 2012 Release date: 22 May 2012 All Combat level: 98 Combat level: 98 All Is members only: true Is members only: true All NPC ID: 15463 NPC ID: 15463

[FAQ] • [doc]

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. 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. Alternatively, players could disassemble the drops for Invention experience and materials.

Drops

100% drop

	Item	Quantity	Rarity	GE price
	Big bones	1	Always	203

Charms

No charm
87–88%	3%	1–2%	8–9%	0.5–0.7%
Represents a 90% confidence range based on a sample of 14,187 kills. 1 charm is dropped at a time. Add data to the log (requires JavaScript).

Main drops

	Item	Quantity	Rarity	GE price
	Adamant chainbody	1	Common	7,111
	Adamant sq shield	1	Common	5,225
	Rune dagger	1	Common	4,141
	Rune helm	1	Common	10,533
	Rune mace	1	Common	7,165
	Rune longsword	1	Uncommon	17,883
	Off-hand rune dagger	1	Common	3,842
	Off-hand rune mace	1	Common	7,202
	Off-hand rune longsword	1	Uncommon	18,210
	Royal cape	1	Rare	723
	Grimy guam	1	Uncommon	709
	Grimy marrentill	1	Uncommon	2,307
	Grimy tarromin	1	Uncommon	105
	Grimy harralander	1	Uncommon	741
	Grimy ranarr	1	Rare	1,860
	Grimy irit	1	Rare	5,008
	Grimy avantoe	1	Rare	1,043
	Grimy kwuarm	1	Rare	11,782
	Grimy cadantine	1	Very rare	4,322
	Grimy lantadyme	1	Very rare	7,551
	Grimy dwarf weed	1	Very rare	8,476
	Fellstalk seed	2	Common	1,450
	Belladonna seed	1	Rare	1,007
	Cactus seed	1	Rare	1,016
	Poison ivy seed	1	Rare	302
	Toadflax seed	1	Uncommon	9,872
	Irit seed	1	Rare	1,018
	Avantoe seed	1	Rare	375
	Kwuarm seed	1	Rare	12,857
	Snapdragon seed	1	Very rare	293
	Cadantine seed	1	Very rare	1,438
	Lantadyme seed	1	Very rare	726
	Dwarf weed seed	1	Very rare	822
	Torstol seed	1	Very rare	540
	Flax	50–100 (noted)	Common	4,800–9,600
	Runite ore	1	Common	1,419
	Adamantite ore	3 (noted)	Common	681
	Royal dragonhide	1	Uncommon	4,332
	Coins	5,000	Common	5,000
	Saradomin brew (2)	1	Common	9,136
	Super restore (2)	1	Common	1,122
	Shark	2	Common	3,866

Tertiary drops

    

	Item	Quantity	Rarity	GE price
	Long bone	1	Rare	Not sold
	Curved bone	1	Rare	Not sold
	Sealed 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 drops

This monster has access to the rare drop table.
Luck-enhancing items such as a ring of wealth or luck of the dwarves are not required to access the table.

Show/hide rare drop table
	Item	Quantity	Rarity	GE price
	Coins	250–500	Common	250–500
	Uncut sapphire	1	Common	809
	Uncut emerald	1	Common	2,555
	Uncut ruby	1	Common	1,842
	Uncut diamond	1	Common	4,843
	Uncut diamond	45–55 (noted)	Rare	217,935–266,365
	Loop half of a key	1	Common	11,053
	Tooth half of a key	1	Common	11,538
	Uncut dragonstone	1	Uncommon	12,077
	Uncut dragonstone	45–55 (noted)	Rare	543,465–664,235
	Dragon longsword	1	Common	56,212
	Dragon spear	1	Rare	35,861
	Battlestaff	180–220 (noted)	Rare	542,160–662,640
	Rune javelin	5	Rare	905
	Rune platebody	1	Uncommon	37,480
	Rune platebody	15–25 (noted)	Rare	562,200–937,000
	Shield left half	1	Rare	64,399
	Dragon helm	1	Uncommon	58,601
	Rune arrowheads	113–137	Common	14,916–18,084
	Onyx bolts	135–165	Very rare	1,003,725–1,226,775
	Chaos talisman	1	Rare	1,923
	Nature talisman	1	Rare	1,473
	Water talisman	65–82 (noted)	Rare	164,320–207,296
	Earth talisman	65–82 (noted)	Rare	12,025–15,170
	Fire talisman	25–35 (noted)	Rare	5,225–7,315
	Raw lobster	135–165 (noted)	Common	47,655–58,245
	Raw shark	225–275 (noted)	Uncommon	321,075–392,425
	Big bones	68–82 (noted)	Uncommon	13,804–16,646
	Dragon bones	180–220 (noted)	Rare	384,480–469,920
	Coal	200–1,100 (noted)	Uncommon	22,400–123,200
	Gold ore	90–110 (noted)	Common	52,830–64,570
	Adamantite ore	180–220 (noted)	Uncommon	40,860–49,940
	Adamant bar	14–16 (noted)	Common	24,654–28,176
	Adamant bar	135–165 (noted)	Rare	237,735–290,565
	Runite ore	90–110 (noted)	Rare	127,710–156,090
	Rune bar	3 (noted)	Common	8,955
	Rune bar	45–55 (noted)	Rare	134,325–164,175
	Grimy torstol	90–110 (noted)	Uncommon	485,010–592,790
	Grimy snapdragon	90–110 (noted)	Uncommon	161,010–196,790
	Super restore (4)	45–55 (noted)	Uncommon	125,910–153,890
	Prayer potion (4)	45–55 (noted)	Uncommon	130,950–160,050
	Lantadyme seed	14–16	Uncommon	10,164–11,616
	Dwarf weed seed	14–16	Uncommon	11,508–13,152
	Magic seed	4	Uncommon	209,856
	Palm tree seed	10	Rare	396,000
	Flax	450–550 (noted)	Common	43,200–52,800
	Molten glass	45–55 (noted)	Common	27,585–33,715
	Soft clay	450–550 (noted)	Uncommon	188,550–230,450
	Yew logs	68–82 (noted)	Uncommon	11,356–13,694
	Yew logs	675–825 (noted)	Rare	112,725–137,775
	Teak plank	45–55 (noted)	Uncommon	16,740–20,460
	Mahogany plank	270–330 (noted)	Rare	356,670–435,930
	Blurberry Special	1	Uncommon	12,008
	Vecna skull	1	Very rare*	124,871
	Hazelmere's signet ring	1	Very rare*	1,432,268,388
	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
	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

Universal drops

Universal drops are dropped by nearly every monster outside of Daemonheim.

These drops are dropped alongside main drops.

	Item	Quantity	Rarity	GE price
	Key token	1	Rare	Not sold
	Mimic kill token	1	Very rare	5,575

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.
• On 17 June 2013, these monsters received a massive power increase. Their life points 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 life points 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.