As you explore the Abyssal Shrine, you get the sudden and overwhelming feeling that you're about to be shot in the head... but you just can't find out why-

Whoosh!

An odd, menacing, crystal-like sound whizzes past your ear, and the source of it shatters against a wall, just barely missing a lethal blow! An airborn icicle totally just flew past you! By instinct alone, you can hardly assess your adversary by the time you're turned around in a fighting stance! Though your long travels through Yggdrasil have sharpened you, and made you formidable in your class, even the deepest, most confident part of your heart can recognize the threat that floats ominously before you...

Your opponent seems to be a dreaded deep one, enemy of humanity! It seems that you must destroy this deep-sea shade born from evil if you want to move forward with your head intact!