help....on ZPH

[GRIF16]

i have 2 pure metals and am going for the 4th map in the ocean kings dungeon......how do i get further....i can't find where to go in there......i looked everywhere....what floor is it on....and what floor do i half to use the Last item i got????????(for anyone who might know what item)

[Coolza]

Use spoiler tags next time.

Spoiler

When you go to the furthest part of the dungeon in the last room should be a blob-guy-thing or a stone tablet.
Put the objects on in this order: Square, Circle, Triangle
Once you do that go inside and the ground will shake.
Go outside and everything will be different.