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 Big bones 1 Always 202
Heavy box Heavy box 1 Always Not sold


Item Quantity Rarity GE market price
Watermelon seed 5 Watermelon seed 1 Uncommon 115
Poison ivy seed 5 Poison ivy seed 1 Uncommon 15
Herb seed 5 Guam seed 1 Uncommon 9
Herb seed 5 Marrentill seed 1 Uncommon 6
Herb seed 5 Tarromin seed 1 Uncommon 6
Herb seed 5 Harralander seed 1 Uncommon 18
Herb seed 5 Toadflax seed 1 Uncommon 356
Herb seed 5 Ranarr seed 1 Uncommon 38,516
Herb seed 5 Irit seed 1 Uncommon 31
Herb seed 5 Avantoe seed 1 Uncommon 1,229
Herb seed 5 Kwuarm seed 1 Uncommon 481
Herb seed 5 Snapdragon seed 1 Uncommon 51,902
Herb seed 5 Cadantine seed 1 Uncommon 1,635
Herb seed 5 Lantadyme seed 1 Uncommon 1,683
Herb seed 5 Dwarf weed seed 1 Uncommon 865
Herb seed 5 Torstol seed 1 Very rare 49,149


Item Quantity Rarity GE market price
Coins 25 Coins 23; 32; 44 Uncommon Not sold
Adamant dart tip Adamant dart tip 2 Uncommon 420
Pearl bolt tips 5 Pearl bolt tips 3 Uncommon 51
Broad arrow 5 Broad arrow 4 Uncommon Not sold
Water orb Water orb 1 Uncommon 1,357
Water rune Water rune 15 Uncommon 75
Mist rune Mist rune 1 Uncommon 97
Fishing bait Fishing bait 50 Uncommon 200
Raw bass Raw bass 2 Uncommon 352
Raw lobster Raw lobster 1 Rare 157
Casket Casket 1 Rare 941
Clue scroll (medium) Clue scroll (medium) 1 Rare Not sold
Long bone Long bone 1 Rare (1/400) Not sold
Curved bone Curved bone 1 Very rare (1/5,000) Not sold