Lobstrosity

Lobstrosity
Released	7 September 2017 (Update)
Members	Yes
Combat level	68
Size	3x3
Examine	An extremely vicious lobster type thing.
Combat info
Max hit	9
Aggressive	Yes
Poisonous	No
Attack style	Stab
Attack speed
Respawn time	25 ticks (15 seconds)
Slayer info
Slayer level	None
Slayer XP	50 xp
Category	Scorpions
Assigned by
Combat stats
Aggressive stats
Defensive stats
Immunities
Poison	Not immune
Venom	Not immune
Advanced data
Monster ID	7796

Lobstrosities are giant "lobster-type thing[s]" located in the south-east corner of the Underwater area of Fossil Island. Most weapons and shields cannot be equipped in this area. Weapons that can be equipped and used to kill lobstrosities include the merfolk trident, trident of the seas/swamp, brine sabre, and magic secateurs. Lobstrosities may also be killed with magic.

A fishbowl helmet cannot be worn in this area, but players can easily use the nearby air bubbles to replenish oxygen while fighting lobstrosities.

Seaweed spores will spawn around the area randomly. Though not confirmed, it appears that by re-entering the area by using the rift or underground tunnel after receiving three random seaweed spores spawns increases the amount of random seaweed spores that spawns afterwards.

Locations[edit | edit source]

Location	Levels	Members	Spawns	Map
Underwater area of Fossil Island	68		9	Maplink

Drops[edit | edit source]

Drop rates estimated based on 214,390 samples from the Drop Rate Project, unless otherwise cited.

The average Lobstrosity kill is worth 1,277.31.

100%[edit | edit source]

	Item	Quantity	Rarity	Price	High Alch
	Raw lobster	1	Always	140	42

Runes[edit | edit source]

Item	Quantity	Rarity	Price	High Alch
Water rune	100	8/118	500	200
Chaos rune	20	8/118	1,220	1,080
Death rune	10	5/118	1,270	1,080
Nature rune	10	6/118	960	1,080

Noted herbs[edit | edit source]

2 herbs are dropped at a time, and can be of different types.

Item	Quantity	Rarity	Price	High Alch
Grimy kwuarm	1 (noted)	2 × 15/944	3,735	12
Grimy cadantine	1 (noted)	2 × 3/236	3,708	13
Grimy lantadyme	1 (noted)	2 × 9/944	1,520	13
Grimy dwarf weed	1 (noted)	2 × 3/326	1,090	14

Un-noted herbs[edit | edit source]

There is a 14/118 chance of rolling the herb drop table. 2 herbs are dropped at a time, and can be of different types.

Item	Quantity	Rarity	Price	High Alch
Grimy guam leaf	1	1/33.7	57	7
Grimy marrentill	1	1/45	31	8
Grimy tarromin	1	1/59.9	158	9
Grimy harralander	1	1/77.1	522	9
Grimy ranarr weed	1	1/98.1	5,785	18
Grimy irit leaf	1	1/134.9	1,058	10
Grimy avantoe	1	1/179.8	2,863	10
Grimy kwuarm	1	1/215.8	3,735	12
Grimy cadantine	1	1/269.7	3,708	13
Grimy lantadyme	1	1/359.6	1,520	13
Grimy dwarf weed	1	1/359.6	1,090	14

Seeds[edit | edit source]

There is a 4/118 chance of dropping 2 seeds from the Uncommon seed drop table, and a 5/128 chance of dropping 1 seed from the Rare seed drop table.

Item	Quantity	Rarity	Price	High Alch
Seaweed spore	5	6/118	1,105	60
Limpwurt seed	1	1/225.7	8	7
Strawberry seed	1	1/236	4	10
Marrentill seed	1	1/247.3	7	1
Jangerberry seed	1	1/336	3	36
Tarromin seed	1	1/363.7	11	1
Wildblood seed	1	1/372.5	19	8
Watermelon seed	1	1/490.7	14	33
Harralander seed	1	1/552.1	23	2
Snape grass seed	1	1/772.9	3,280	56
Ranarr seed	1	1/792.7	18,474	30
Whiteberry seed	1	1/909.3	6	79
Mushroom spore	1	1/1,066.1	42	51
Toadflax seed	1	1/1,145	655	6
Belladonna seed	1	1/1,717.6	97	106
Irit seed	1	1/1,717.6	37	3
Poison ivy seed	1	1/2,378.2	12	99
Avantoe seed	1	1/2,576.3	1,026	4
Cactus seed	1	1/2,576.3	66	59
Kwuarm seed	1	1/3,435.1	1,087	6
Potato cactus seed	1	1/3,864.5	7	84
Snapdragon seed	1	1/6,183.2	29,730	36
Cadantine seed	1	1/7,729	1,843	4
Lantadyme seed	1	1/10,305.3	319	5
Dwarf weed seed	1	1/15,458	325	3
Torstol seed	1	1/30,916	6,676	42
Toadflax seed	1	1/118.5	655	6
Irit seed	1	1/174.1	37	3
Belladonna seed	1	1/179.7	97	106
Poison ivy seed	1	1/253.2	12	99
Avantoe seed	1	1/253.2	1,026	4
Cactus seed	1	1/265.2	66	59
Potato cactus seed	1	1/371.3	7	84
Kwuarm seed	1	1/371.3	1,087	6
Snapdragon seed	1	1/557	29,730	36
Cadantine seed	1	1/795.7	1,843	4
Lantadyme seed	1	1/1,113.9	319	5
Snape grass seed	3	1/1,392.4	9,840	168
Dwarf weed seed	1	1/1,856.5	325	3
Torstol seed	1	1/2,784.8	6,676	42

Other[edit | edit source]

Item	Quantity	Rarity	Price	High Alch
Coins	1,000	9/118	1,000	1,000
Pufferfish	1	8/118	Not sold	138
Giant seaweed	6 (noted)	8/118	1,326	6
Seaweed	6 (noted)	8/118	84	6
Toad's legs	2 (noted)	6/118	1,000	2
Caviar	2 (noted)	5/118	282	60
Oyster pearls	1	4/118	913	840

Gem drop table[edit | edit source]

There is a 3/118 chance of rolling the gem drop table.

Item	Quantity	Rarity	Price	High Alch
Nothing	N/A	1/78.81; Never^{[d 1]}	N/A	N/A
Uncut sapphire	1	1/157.33; 1/79.9^{[d 2]}	308	15
Uncut emerald	1	1/314.67; 1/159.79^{[d 2]}	497	30
Uncut ruby	1	1/629.33; 1/319.58^{[d 2]}	1,033	60
Nature talisman	1	1/1,678.22; 1/852.22^{[d 2]}	164	2
Uncut diamond	1	1/2,517.33; 1/1,278.33^{[d 2]}	2,402	120
Loop half of key	1	1/5,034.67; 1/2,556.67^{[d 2]}	9,498	60
Tooth half of key	1	1/5,034.67; 1/2,556.67^{[d 2]}	9,446	60
Rune javelin	5	1/5,034.67; 1/2,556.67^{[d 2]}	940	1,200
Rune spear	1	1/80,554.67; 1/4,793.75^{[d 2]}^{[d 3]}	11,958	12,480
Shield left half	1	1/161,109.33; 1/9,587.5^{[d 2]}^{[d 3]}	65,611	66,000
Dragon spear	1	1/214,812.44; 1/12,783.33^{[d 2]}^{[d 3]}	37,435	37,440

^ The "nothing" drop is removed while wearing a ring of wealth.
^ ^2.00 ^2.01 ^2.02 ^2.03 ^2.04 ^2.05 ^2.06 ^2.07 ^2.08 ^2.09 ^2.10 The drop rate is increased while wearing a ring of wealth due to the "nothing" drop being removed.
^ ^3.0 ^3.1 ^3.2 Only dropped if Legends' Quest has been finished; if not, a talisman is dropped instead.

Tertiary[edit | edit source]

Item	Quantity	Rarity	Price	High Alch
Numulite	5–14	9/35	130–364	150–420
Unidentified small fossil	1	1/70	Not sold	60
Unidentified medium fossil	1	1/140	Not sold	120
Unidentified large fossil	1	1/175	Not sold	180
Unidentified rare fossil	1	1/700	Not sold	750
Clue scroll (easy)	1	1/128^{[d 1]}^[1]	Not sold	12

^ The easy clue scroll drop rate increases to 1/121 after unlocking the easy Combat Achievements rewards tier.

Changes[edit | edit source]

Date	Changes
12 July 2018 (update \| poll)	Lobstrosities now drop a maximum of 5 seaweed spores instead of 1.

Trivia[edit | edit source]

Lobstrosity could be a reference to The Dark Tower series by Stephen King where creatures of the same name appear in the second book, The Drawing of the Three.

References[edit | edit source]

^ Jagex. Mod Tide's Twitter account. 24 May 2019. Archived from the original on 24 May 2019. Mod Tide: "I know its been a while since the clue expansion but here is the information on clue scroll drop rates and loot chances! If anything changes I will keep you posted."

[1] The "nothing" drop is removed while wearing a ring of wealth.

[row-2] 2.00 ^2.01 ^2.02 ^2.03 ^2.04 ^2.05 ^2.06 ^2.07 ^2.08 ^2.09 ^2.10 The drop rate is increased while wearing a ring of wealth due to the "nothing" drop being removed.

[rowm-3] 3.0 ^3.1 ^3.2 Only dropped if Legends' Quest has been finished; if not, a talisman is dropped instead.

[5] The easy clue scroll drop rate increases to 1/121 after unlocking the easy Combat Achievements rewards tier.

[Clue_rates_tweet-4] Jagex. Mod Tide's Twitter account. 24 May 2019. Archived from the original on 24 May 2019. Mod Tide: "I know its been a while since the clue expansion but here is the information on clue scroll drop rates and loot chances! If anything changes I will keep you posted."

[d 1]

[d 2]

[d 3]

[d 1]

[1]

Lobstrosity

Contents

Locations[edit | edit source]