Gleason's Gielinor Guide

Giant Sea Snake

Released		22 May 2006 (Update)
Members		Yes
Combat level		149
Size		5x5
Examine		A big snake that lives in the sea. How did it get in here?
Combat info
XP bonus		+0%
Max hit		14
Aggressive		Yes
Poisonous		Yes (9)
Attack style		Crush, Ranged
Attack speed		4 ticks (2.4 seconds)
Slayer info
Slayer level		40
Slayer XP		N/A
Category		Sea Snakes
Assigned by
Combat stats

100	170	90	160	1	130
Aggressive stats

+0	+0	+0	+0	+0	+0
Melee defence

+0		+0		+0
Magic defence

+0			20% weakness
Ranged defence

+0		+0		+0
Immunities
Poison		100% resistance
Venom		100% resistance
Open in DPS calculator
Advanced data
Monster ID		1101
Link		MOID

The Giant Sea Snake is encountered at the end of the Royal Trouble quest. Level 40 Slayer is required to damage the snake. It drops the heavy box which is needed to finish the quest.

It is not as strong as its combat level suggests, but some form of antipoison is vital, as the snake can inflict poison that starts at 9 damage. It fights with melee up close and ranged from a distance, but it cannot detect the use of prayers. Like its offspring, it is vulnerable to Magic, especially earth spells. The best way to defeat the snake is to attack it from afar with magic to exploit its weakness while praying Protect from Missiles to prevent taking damage besides from poison. A dwarf multicannon can be set up nearby.

It cannot be fought after completion of the Royal Trouble quest, so it cannot be killed on a sea snake task.

Drops

The following drop rates are provided by Jagex, unless otherwise specified.

The average Giant Sea Snake kill is worth 3,412.76.

100%

	Item	Quantity	Rarity	Price	High Alch
	Big bones	1	Always	311	0

Runes and ammunition

Item	Quantity	Rarity	Price	High Alch
Water rune	15	2/128	75	30
Mist rune	1	2/128	88	12
Broad arrows	4	2/128	Not sold	144

Herbs

The herb drop table is only rolled in rare circumstances when the player stands on the south-west tile of the Giant Sea Snake at the moment the drop is rolled. In practice this happens about 0.2% of the time.

There is a 5/128 chance of rolling the herb drop table.

Item	Quantity	Rarity	Price	High Alch
Grimy guam leaf	1	1/102.4	294	7
Grimy marrentill	1	1/136.5	243	8
Grimy tarromin	1	1/182	198	9
Grimy harralander	1	1/234.1	324	9
Grimy ranarr weed	1	1/297.9	5,777	18
Grimy irit leaf	1	1/409.6	1,327	10
Grimy avantoe	1	1/546.1	1,789	10
Grimy kwuarm	1	1/655.4	2,272	12
Grimy cadantine	1	1/819.2	2,149	13
Grimy lantadyme	1	1/1,092.3	1,148	13
Grimy dwarf weed	1	1/1,092.3	1,263	14

Seeds

There is a 14/128 chance of rolling the uncommon seed drop table.

Item	Quantity	Rarity	Price	High Alch
Limpwurt seed	1	1/69.9	16	7
Strawberry seed	1	1/73.1	5	10
Marrentill seed	1	1/76.7	20	1
Jangerberry seed	1	1/104.1	6	36
Tarromin seed	1	1/112.7	10	1
Wildblood seed	1	1/115.4	69	8
Watermelon seed	1	1/152.1	92	33
Harralander seed	1	1/171.1	24	2
Snape grass seed	1	1/239.5	12,085	56
Ranarr seed	1	1/245.7	32,494	30
Whiteberry seed	1	1/281.8	10	79
Mushroom spore	1	1/330.4	81	51
Toadflax seed	1	1/354.9	1,057	6
Belladonna seed	1	1/532.3	104	106
Irit seed	1	1/532.3	68	3
Poison ivy seed	1	1/737.1	12	99
Avantoe seed	1	1/798.5	249	4
Cactus seed	1	1/798.5	81	59
Kwuarm seed	1	1/1,064.6	1,589	6
Potato cactus seed	1	1/1,197.7	11	84
Snapdragon seed	1	1/1,916.3	46,297	36
Cadantine seed	1	1/2,395.4	2,544	4
Lantadyme seed	1	1/3,193.9	165	5
Dwarf weed seed	1	1/4,790.9	520	3
Torstol seed	1	1/9,581.7	14,154	42

Coins

Item	Quantity	Rarity	Price	High Alch
Coins	44	41/128	44	44
Coins	32	11/128	32	32
Coins	24	9/128	24	24
Coins	23	7/128	23	23

Other

Item	Quantity	Rarity	Price	High Alch
Adamant dart tip	2	10/128	378	42
Fishing bait	50	4/128	250	50
Pearl bolt tips	3	4/128	24	21
Water orb	1	3/128	966	180
Raw bass	2	4/128	18	48
Raw lobster	1	2/128	126	42
Seaweed	5	2/128	25	5
Edible seaweed	5	2/128	160	5
Casket	1	2/128	698	30
Oyster pearl	2	1/128	62	134
Oyster pearls	1	1/128	527	840

Gem drop table

There is a 1/128 chance of rolling the gem drop table.

Item	Quantity	Rarity	Price	High Alch
Nothing	N/A	1/256.47; Never^{[d 1]}	N/A	N/A
Uncut sapphire	1	1/512; 1/260^{[d 2]}	206	15
Uncut emerald	1	1/1,024; 1/520^{[d 2]}	416	30
Uncut ruby	1	1/2,048; 1/1,040^{[d 2]}	1,011	60
Chaos talisman	1	1/5,461.33; 1/2,773.33^{[d 2]}	213	2
Uncut diamond	1	1/8,192; 1/4,160^{[d 2]}	2,455	120
Rune javelin	5	1/16,384; 1/8,320^{[d 2]}	650	1,200
Loop half of key	1	1/16,384; 1/8,320^{[d 2]}	9,737	60
Tooth half of key	1	1/16,384; 1/8,320^{[d 2]}	9,917	60
Rune spear	1	1/262,144; 1/15,600^{[d 2]}^{[d 3]}	11,769	12,480
Shield left half	1	1/524,288; 1/31,200^{[d 2]}^{[d 3]}	65,429	66,000
Dragon spear	1	1/699,050.67; 1/41,600^{[d 2]}^{[d 3]}	37,749	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

Item	Quantity	Rarity	Price	High Alch
Heavy box	1	Always	Not sold	6
Clue scroll (medium)	1	1/128^{[d 1]}^{[d 2]}	Not sold	12
Long bone	1	1/400	Not sold	3
Curved bone	1	1/5,012.5	Not sold	4
Water sapphire	1	1/64	174,582	12,000

^ The medium clue scroll drop rate increases to 1/121 after unlocking the medium Combat Achievements rewards tier.
^ Clue scrolls will drop as scroll boxes after the completion of X Marks the Spot.

Collection log

Giant Sea Snakes have a single collection log item.

Item	Collections	Comp%
Water sapphire	Slayer	N/A

Changes

Date	Changes
25 June 2025 (Update)	The giant sea snake was given a 20% elemental weakness to earth spells.