User blog comment:Lord Loss/Monster Appreciation Day: Plesioth/@comment-4212769-20120215164215/@comment-10973148-20120329165046

You can kill big Plesioth very fast with the King Thundersword (GreatSword), stand between his legs and attack frequently, but try to position yourself to the back of his left foot, so you can dodge his Hip attack. (I used Akantor armor for the G Plesioth... and on HR the Cenataur armor, and always with an GS, I prefer to block)

Use the circle when facing both legs and triangle to hit his belly and gain distance towards his back(so the dodging is easier). Do not use triangle+circle(upward swing), you'll be too exposed that way.

It doesn't matter if it's enraged or not, keep dodging between his legs to the back, and keep him on the land. He should be easy to capture/kill that way. (always capture, you'll need those fins ;)