Mature grotworm

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

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Mature grotworm
Release																				22 May 2012 (Update)
Members																				Yes
Options																				Attack, Examine
Race																				Grotworm
Examine																				The final stage of a grotworm before its metamorphosis.
Combat info
Combat level																				98
Life points																				12,800
Aggressive
Poisonous
Combat experience
XP																				640
XP																				343.6
XP																				211.2
XP																				57 (two-handed) 28 (one-handed and armour)
Slayer info
Level																				1
Assignment																				Grotworms
Master																				The Raptor: 140–190 Vannaka: 40–60 Mazchna: 60–100 Chaeldar: 70–110 Sumona: 70–120 Duradel: 80–120 Kuradal: 80–150 Morvran: 100–180
Offensive
Max hit
1,400												0												1,400												0												0
Style																														Rate
																														4 ticks (2.4s)
Combat levels
70															1															70															1
Accuracy
1,386															0															1,386															0
Defensive
Armour																				Weakness															Susceptible
1,486										70
Base hit chance
90															45															65															55
Immunities
Not immune															Not immune															Not immune															Not immune
Advanced data
NPC ID															15463
Links															bestiary • MRND

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, they only use magic at a distance and only melee up close (they do not move closer to use melee), similar to monsters such as metal dragons.

The magic attack has a range of 7, so is possible to safe spot them using the pillars with Ranged or Magic if you stand far enough away. Lower-level players are recommended to bring high healing food such as monkfish or sharks.

Using high level ranged gear such as Armadyl equipment 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 salvage 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.

Locations

Location	Levels	Members	Requirements	Spawns	Map
Grotworm Lair	98		None	28	Show map

Drops

Drop rates estimated based on 55,659 samples from the Drop Log Project, unless otherwise cited.

The average Mature grotworm kill is worth 4,609 coins.

100% drop

	Item	Quantity	Rarity	GE price	High Alch
	Big bones	1	Always	225	1

Charms

Nothing	1	1	1	1
87%	3%	1–2%	8–9%	0.5–0.7%
Represents a 90% confidence range based on a sample of 15,500 kills. 1 item is dropped at a time. Add data to the log (requires JavaScript).

Herbs

There is an 11/128 chance of rolling the herb drop table.

	Item	Quantity	Rarity	GE price	High Alch
	Grimy guam	1	1/46.5	260	18
	Grimy marrentill	1	1/62.1	4,671	1
	Grimy tarromin	1	1/82.7	207	1
	Grimy harralander	1	1/106.4	1,472	1
	Grimy ranarr	1	1/135.4	2,066	1
	Grimy irit	1	1/186.2	649	1
	Grimy avantoe	1	1/248.2	510	1
	Grimy kwuarm	1	1/297.9	4,808	1
	Grimy cadantine	1	1/372.4	925	1
	Grimy lantadyme	1	1/496.5	5,035	1
	Grimy dwarf weed	1	1/496.5	4,843	1

Seeds

There is a 3/128 chance of rolling the rare seed drop table. There is an additional 3/128 chance to roll for fellstalk seeds.

	Item	Quantity	Rarity	GE price	High Alch
	Fellstalk seed	2	3/128	10,602	76
	Toadflax seed	1	1/195	663	20
	Irit seed	1	1/287.4	366	38
	Cave nightshade seed	1	1/303.4	581	106
	Poison ivy seed	1	1/420.1	209	99
	Avantoe seed	1	1/420.1	1,383	38
	Cactus seed	1	1/455.1	1,070	59
	Kwuarm seed	1	1/606.8	333	38
	Snapdragon seed	1	1/910.2	2,412	38
	Cadantine seed	1	1/1,365.3	335	38
	Lantadyme seed	1	1/1,820.4	356	38
	Dwarf weed seed	1	1/2,730.7	1,027	38
	Torstol seed	1	1/5,461.3	510	38

Consumables

	Item	Quantity	Rarity	GE price	High Alch
	Shark	2	9/128	596	360
	Saradomin brew (2)	1	5/128	3,940	90
	Super restore (2)	1	21/128	1,064	108

Spirits

	Item	Quantity	Rarity	GE price	High Alch
	Adamantite stone spirit	3	6/128	93	N/A
	Runite stone spirit	1	9/128	1,966	N/A
	Magic wood spirit	2	10/128	1,254	N/A

Salvage

	Item	Quantity	Rarity	GE price	High Alch
	Medium plated adamant salvage	1	6/128	4,162	6,000
	Tiny plated rune salvage	1	7/128	6,466	8,000
	Tiny blunt rune salvage	1	6/128	5,449	8,000
	Tiny spiky rune salvage	1	6/128	6,365	8,000
	Medium bladed rune salvage	1	6/128	21,329	24,000

Other

	Item	Quantity	Rarity	GE price	High Alch
	Coins	5,000	10/128	5,000	5,000
	Flax	50–100 (noted)	5/128	4,800–9,600	150–300
	Royal dragonhide	1	4/128	2,502	60
	Royal cape	1	1/256	741	300
	Rare drop table	1	1/256	Not sold	N/A

Rare drop table

There is a 1/256 chance of rolling the rare drop table.
Luck-enhancing items are not required to access the table, but they will increase the chance of accessing the rare drop table and may also improve the loot received from it.

Rare drop table

Item Quantity Rarity GE price High Alch Uncut dragonstone (m) 1 1/2,048–1/1,664 5,530 600 Tooth half of a key (m) 1 1/2,730.67–1/2,218.67 8,675 1 Loop half of a key (m) 1 1/2,730.67–1/2,218.67 8,636 1 Huge plated rune salvage 1 (noted) 1/3,276.8–1/2,662.4 37,670 40,000 Magic logs (m) 65–85 (noted) 1/4,096–1/3,328 51,480–67,320 12,480–16,320 Rune arrowheads 110–140 1/4,096–1/3,328 18,040–22,960 660–840 Soft clay (m) 35–45 (noted) 1/4,096–1/3,328 74,515–95,805 35–45 Small bladed orikalkum salvage (m) 1 (noted) 1/8,192–1/6,656 47,493 50,000 Catalytic anima stone (m) 35–45 1/8,192–1/6,656 42,000–54,000 6,300–8,100 Teak plank (m) 45–55 (noted) 1/8,192–1/6,656 9,225–11,275 13,500–16,500 Dragon bones (m) 35–45 (noted) 1/8,192–1/6,656 68,040–87,480 35–45 Dragon helm (m) 1 1/7,302.06–1/5,932.92 57,807 60,000 Dragon longsword (m) 1 1/26,346.13–1/21,406.23 57,017 60,000 Off-hand dragon longsword (m) 1 1/26,346.13–1/21,406.23 56,388 60,000 Molten glass (m) 45–55 (noted) 1/4,096; 0 16,605–20,295 45–55 Runite stone spirit (m) 27–33 1/4,096; 1/3,840; 0 53,082–64,878 N/A Raw lobster (m) 135–165 (noted) 1/4,096–1/3,584; 0 32,130–39,270 22,950–28,050 Shield left half (m) 1 1/131,072–1/106,496 70,017 66,000 Dragon spear (m) 1 1/74,898.29–1/60,854.86 34,273 37,440 Huge plated rune salvage 18–22 (noted) 1/174,762.67–1/141,994.67 678,060–828,740 720,000–880,000 Yew logs 675–825 (noted) 1/131,072–1/106,496 456,300–557,700 64,800–79,200 Super restore (4) (m) 45–55 (noted) 1/87,381.33–1/70,997.33 125,415–153,285 8,100–9,900 Prayer potion (4) 45–55 (noted) 1/87,381.33–1/70,997.33 319,455–390,445 5,130–6,270 Raw rocktail (m) 180–220 (noted) 1/104,857.6–1/85,196.8 153,540–187,660 64,800–79,200 Mahogany plank (m) 270–330 (noted) 1/174,762.67–1/141,994.67 237,330–290,070 243,000–297,000 Magic seed (m) 3–5 1/262,144–1/212,992 75,459–125,765 759–1,265 Water talisman 68–82 (noted) 1/327,680–1/266,240 47,872–57,728 136–164 Battlestaff (m) 180–220 (noted) 1/327,680–1/266,240 714,420–873,180 756,000–924,000 Hardened dragon bones (m) 45–55 (noted) 1/262,144–1/212,992 564,390–689,810 45–55 Onyx bolt tips (m) 135–165 1/327,680–1/266,240 868,320–1,061,280 729,000–891,000 Ciku seed (m) 1 1/327,680–1/266,240 35,472 300 Golden dragonfruit seed (m) 13–17 1/174,762.67–1/141,994.67 23,608–30,872 3,900–5,100 Uncut diamond 45–55 (noted) 1/104,857.6–1/85,196.8 42,030–51,370 5,400–6,600 Uncut dragonstone (m) 45–55 (noted) 1/262,144–1/212,992 248,850–304,150 27,000–33,000 Soul rune (m) 450–550 1/327,680–1/266,240 310,950–380,050 36,900–45,100 Light animica stone spirit (m) 270–330 1/131,072–1/106,496 144,180–176,220 N/A Dark animica stone spirit (m) 270–330 1/131,072–1/106,496 140,130–171,270 N/A Primal stone spirit (m) 90–150 1/124,830.48–1/101,424.76 1,674,360–2,790,600 N/A Crystal key (m) 9–11 (noted) 1/43,690.67–1/35,498.67 148,248–181,192 9–11 White berries (m) 67–85 (noted) 1/174,762.67–1/141,994.67 130,918–166,090 402–510 Ectoplasm (m) 270–330 1/131,072–1/106,496 481,950–589,050 1,620–1,980 Medium spiky orikalkum salvage (m) 3–5 (noted) 1/131,072–1/106,496 217,365–362,275 225,000–375,000 Large blunt necronium salvage (m) 2 (noted) 1/174,762.67–1/141,994.67 644,522 650,000 Wine of Saradomin (m) 13–17 (noted) 1/327,680–1/266,240 573,352–749,768 13–17 Aura refresh (m) 1 1/104,857.6–1/85,196.8 Not sold N/A Distraction & Diversion reset token (daily) (m) 1 1/262,144–1/212,992 Not sold N/A Distraction & Diversion reset token (weekly) (m) 1 1/262,144–1/212,992 Not sold N/A Distraction & Diversion reset token (monthly) (m) 1 1/262,144–1/212,992 Not sold N/A Vecna skull (m) 1 1/266,240; 0 473,708 6,000 Cheese+tom batta (m) 1 ~1/2,621,440–1/2,293,760; 0 728 1 Blurberry Special (m) 1 ~1/2,366,577.78; 0 46,021 18 Hazelmere's signet ring (m) 1 ~1/21,299,200; 0 6,344,705,771 300,000

Tertiary

	Item	Quantity	Rarity	GE price	High Alch
	Bone fragments	1	Rare	Not sold	N/A
	Long bone	1	1/400	3	3
	Curved bone	1	1/5,012.5	4	4
	Sealed clue scroll (hard)	1	1/120	Not sold	N/A
	Court summons	1	Very rare	1	1
	Spirit sapphire (m)	1	5/2,000	Not sold	N/A
	Spirit emerald (m)	1	3/2,000	Not sold	N/A
	Spirit ruby (m)	1	2/2,000	Not sold	N/A
	Starved ancient effigy	1	~1/18,500	Not sold	N/A

Universal drops

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

These items are dropped alongside main drops.

	Item	Quantity	Rarity	GE price	High Alch
	Key token	1	Rare	Not sold	N/A
	Mimic kill token (m)	1	1/10,000	70,491	N/A

Money making guide

The following money making guide is available for Mature grotworm:

Method	Hourly profit	Skills	Other requirements
Killing mature grotworms	543,807	80  recommended 55  50  recommended	Song from the Depths recommended

Achievements

• Guardian of the Realm ( 0) – Obtained a collection of unique drops from Slayer monsters located within Asgarnia & Misthalin.
  • Royal cape drop

Update history

This information has been compiled as part of the update history project. Some updates may not be included – see here for how to help out!

• patch 25 November 2024 (Update):
  • Replaced the small plated adamant salvage drop with magic wood spirits.

• patch 19 August 2019 (Update):
  • Grotworms are able to damage the player once again.

• patch 8 May 2018 (Update):
  • Corrected an error in mature grotworm's drop table which meant super restores never dropped and Saradomin brews dropped too often.

• update 22 May 2012 (Update):
  • Added to game.

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.