After you have completed that part of the quest it may drop more items, some have claimed to have received seeds and other drops. If you aren't meleeing it, it'll use a magic attack instead of melee.
Tactics
Using Protect from Melee is advised if you have a combat level of 70, or lower. It is also poisonous, so it is suggested to bring anti-poison.
Examine
A big snake that lives in the sea. How did it get in here?
Top Drops
Clue scroll (level-2)
Drops
Big bones (100%), Heavy box, Coins (32), Water orb, Adamant dart tip (2), Water rune (20-32), Belladonna seed, Broad arrow, Giant snake spine
Related Information
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