The Giant Sea Snake is encountered at the end of the Royal Trouble quest. It is not as strong as its combat level suggests, but an antipoison potion, preferably super, is vital, as the snake is poisonous with damage that starts at 9. 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. It drops the heavy box which is needed to finish the quest, and it can only be fought once.

Level 40 Slayer is required to kill this creature.

The best way to defeat the snake is to attack it up close with magic to exploit its weakness. This way, it will not use its ranged attack, so players can freely use Protect from Melee to reduce the majority of the damage. Other factors such as what food to bring and what armour and weapon to use are left to the player's decision. It is recommended to bring at least lobsters or swordfish. A dwarf multicannon can be setup in this area.



Item Quantity Rarity GE market price
Big bones.png Big bones 1 Always 262
Heavy box.png Heavy box 1 Always Not sold


Item Quantity Rarity GE market price
Watermelon seed 5.png Watermelon seed 1 Uncommon 71
Poison ivy seed 5.png Poison ivy seed 1 Uncommon 18
Herb seed 5.png Guam seed 1 Uncommon 9
Herb seed 5.png Marrentill seed 1 Uncommon 5
Herb seed 5.png Tarromin seed 1 Uncommon 10
Herb seed 5.png Harralander seed 1 Uncommon 31
Herb seed 5.png Toadflax seed 1 Uncommon 795
Herb seed 5.png Ranarr seed 1 Uncommon 45,466
Herb seed 5.png Irit seed 1 Uncommon 47
Herb seed 5.png Avantoe seed 1 Uncommon 1,675
Herb seed 5.png Kwuarm seed 1 Uncommon 379
Herb seed 5.png Snapdragon seed 1 Uncommon 54,551
Herb seed 5.png Cadantine seed 1 Uncommon 1,034
Herb seed 5.png Lantadyme seed 1 Uncommon 2,358
Herb seed 5.png Dwarf weed seed 1 Uncommon 423
Herb seed 5.png Torstol seed 1 Very rare 58,385


Item Quantity Rarity GE market price
Coins 25.png Coins 23; 32; 44 Uncommon Not sold
Adamant dart tip.png Adamant dart tip 2 Uncommon 394
Pearl bolt tips 5.png Pearl bolt tips 3 Uncommon 120
Broad arrow 5.png Broad arrow 4 Uncommon Not sold
Water orb.png Water orb 1 Uncommon 1,309
Water rune.png Water rune 15 Uncommon 60
Mist rune.png Mist rune 1 Uncommon 162
Fishing bait.png Fishing bait 50 Uncommon 200
Raw bass.png Raw bass 2 Uncommon 914
Raw lobster.png Raw lobster 1 Rare 210
Casket.png Casket 1 Rare 731
Clue scroll (medium).png Clue scroll (medium) 1 Rare Not sold
Long bone.png Long bone 1 Rare (1/400) Not sold
Curved bone.png Curved bone 1 Very rare (1/5,000) Not sold

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