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 from afar with magic to exploit its weakness. Players can freely use Protect from Missiles to reduce all the damage besides poison. Other factors such as what food to bring and what armour and weapon to use are left to the player to decide. It is recommended to bring at least lobsters or swordfish. A dwarf multicannon can be setup in this area.
Drops
The following drop rates are provided by Jagex, unless otherwise specified.
100%
| Item |
Quantity |
Rarity |
Price |
High Alch |
 | Big bones | 1 | Always | 336 | 0 |
Runes and ammunition
Herbs
The herb drop table is only rolled in rare circumstances when the drop would be unreachable to the player. In practice this happens about 0.2% of the time.
There is a 5/128 chance of rolling the herb drop table.
Seeds
The seed drop table is only rolled in rare circumstances when the drop would be unreachable to the player. In practice this happens about 0.2% of the time.
There is a 14/128 chance of rolling the uncommon seed drop table.
| Item |
Quantity |
Rarity |
Price |
High Alch |
| Limpwurt seed.png: Giant Sea Snake drops Limpwurt seed with rarity 1/69.9 in quantity 1 | Limpwurt seed | 1 | 1/69.9 | 16 | 7 |
| Strawberry seed.png: Giant Sea Snake drops Strawberry seed with rarity 1/73.1 in quantity 1 | Strawberry seed | 1 | 1/73.1 | 7 | 10 |
| Marrentill seed.png: Giant Sea Snake drops Marrentill seed with rarity 1/76.7 in quantity 1 | Marrentill seed | 1 | 1/76.7 | 14 | 1 |
| Jangerberry seed.png: Giant Sea Snake drops Jangerberry seed with rarity 1/104.1 in quantity 1 | Jangerberry seed | 1 | 1/104.1 | 5 | 36 |
| Tarromin seed.png: Giant Sea Snake drops Tarromin seed with rarity 1/112.7 in quantity 1 | Tarromin seed | 1 | 1/112.7 | 14 | 1 |
| Wildblood seed.png: Giant Sea Snake drops Wildblood seed with rarity 1/115.4 in quantity 1 | Wildblood seed | 1 | 1/115.4 | 33 | 8 |
| Watermelon seed.png: Giant Sea Snake drops Watermelon seed with rarity 1/152.1 in quantity 1 | Watermelon seed | 1 | 1/152.1 | 34 | 33 |
| Harralander seed.png: Giant Sea Snake drops Harralander seed with rarity 1/171.1 in quantity 1 | Harralander seed | 1 | 1/171.1 | 38 | 2 |
| Snape grass seed.png: Giant Sea Snake drops Snape grass seed with rarity 1/239.5 in quantity 1 | Snape grass seed | 1 | 1/239.5 | 7,566 | 56 |
| Ranarr seed.png: Giant Sea Snake drops Ranarr seed with rarity 1/245.7 in quantity 1 | Ranarr seed | 1 | 1/245.7 | 27,298 | 30 |
| Whiteberry seed.png: Giant Sea Snake drops Whiteberry seed with rarity 1/281.8 in quantity 1 | Whiteberry seed | 1 | 1/281.8 | 10 | 79 |
| Mushroom spore.png: Giant Sea Snake drops Mushroom spore with rarity 1/330.4 in quantity 1 | Mushroom spore | 1 | 1/330.4 | 123 | 51 |
| Toadflax seed.png: Giant Sea Snake drops Toadflax seed with rarity 1/354.9 in quantity 1 | Toadflax seed | 1 | 1/354.9 | 1,406 | 6 |
| Belladonna seed.png: Giant Sea Snake drops Belladonna seed with rarity 1/532.3 in quantity 1 | Belladonna seed | 1 | 1/532.3 | 175 | 106 |
| Irit seed.png: Giant Sea Snake drops Irit seed with rarity 1/532.3 in quantity 1 | Irit seed | 1 | 1/532.3 | 63 | 3 |
| Poison ivy seed.png: Giant Sea Snake drops Poison ivy seed with rarity 1/737.1 in quantity 1 | Poison ivy seed | 1 | 1/737.1 | 16 | 99 |
| Avantoe seed.png: Giant Sea Snake drops Avantoe seed with rarity 1/798.5 in quantity 1 | Avantoe seed | 1 | 1/798.5 | 2,486 | 4 |
| Cactus seed.png: Giant Sea Snake drops Cactus seed with rarity 1/798.5 in quantity 1 | Cactus seed | 1 | 1/798.5 | 67 | 59 |
| Kwuarm seed.png: Giant Sea Snake drops Kwuarm seed with rarity 1/1,064.6 in quantity 1 | Kwuarm seed | 1 | 1/1,064.6 | 3,820 | 6 |
| Potato cactus seed.png: Giant Sea Snake drops Potato cactus seed with rarity 1/1,197.7 in quantity 1 | Potato cactus seed | 1 | 1/1,197.7 | 12 | 84 |
| Snapdragon seed.png: Giant Sea Snake drops Snapdragon seed with rarity 1/1,916.3 in quantity 1 | Snapdragon seed | 1 | 1/1,916.3 | 41,659 | 36 |
| Cadantine seed.png: Giant Sea Snake drops Cadantine seed with rarity 1/2,395.4 in quantity 1 | Cadantine seed | 1 | 1/2,395.4 | 3,987 | 4 |
| Lantadyme seed.png: Giant Sea Snake drops Lantadyme seed with rarity 1/3,193.9 in quantity 1 | Lantadyme seed | 1 | 1/3,193.9 | 451 | 5 |
| Dwarf weed seed.png: Giant Sea Snake drops Dwarf weed seed with rarity 1/4,790.9 in quantity 1 | Dwarf weed seed | 1 | 1/4,790.9 | 883 | 3 |
| Torstol seed.png: Giant Sea Snake drops Torstol seed with rarity 1/9,581.7 in quantity 1 | Torstol seed | 1 | 1/9,581.7 | 6,381 | 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
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] | 238 | 15 |
 | Uncut emerald | 1 | 1/1,024; 1/520[d 2] | 463 | 30 |
 | Uncut ruby | 1 | 1/2,048; 1/1,040[d 2] | 988 | 60 |
 | Chaos talisman | 1 | 1/5,461.33; 1/2,773.33[d 2] | 309 | 2 |
 | Uncut diamond | 1 | 1/8,192; 1/4,160[d 2] | 2,142 | 120 |
 | Loop half of key | 1 | 1/16,384; 1/8,320[d 2] | 11,919 | 60 |
 | Tooth half of key | 1 | 1/16,384; 1/8,320[d 2] | 11,925 | 60 |
 | Rune javelin | 5 | 1/16,384; 1/8,320[d 2] | 950 | 1,200 |
 | Rune spear | 1 | 1/262,144; 1/15,600[d 2][d 3] | 11,871 | 12,480 |
 | Shield left half | 1 | 1/524,288; 1/31,200[d 2][d 3] | 65,394 | 66,000 |
 | Dragon spear | 1 | 1/699,050.67; 1/41,600[d 2][d 3] | 38,854 | 37,440 |
Tertiary
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| NPCs | |
| | Teenagers |
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| Royalty |
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| Sea Snakes |
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| Items | |
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| Locations |
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| Music |
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| Miscellaneous |
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Fremennik✓
Combat stats
Magic defence
Ranged defence
