Where can it be found

Lighthouse Dungeon

Tactic

This little Dagannoth is very easy to kill. All you need to do is use protect from melee. It does use range attacks as well, so use rune armour or better while fighting it. A granite shield will also help a lot against the ranged attacks. Also, a cannon or red chins will kill these quickly.

Examine Message

A horror from the ocean depths...

Notes

It will switch between range and melee attacks.