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Not to be confused with King Sepiad. A Sepiad serves as one of the bosses of Octonok Cay. It is encountered when Ratchet and the gang travel to a feeding cannon in hopes of making it to the W.A.S.P. This is a guide to defeat it.
The Sepiad is an easy boss. Its main attack is to slap the ground with its tentacles in various ways, all of which are easy to dodge. Dodge the tentacles and fire at the sepiad until it retreats into the water. When it retreats into the water, use a throw attack on the nearby sonic pylon. It will attract the Sepiad, distracting it with bait and exposing its soft underbelly. It is possible to defeat the boss without the sonic pylon. Repeat the strategy until it's beaten.