Ocean

is the Grace possessed by Tarmiel of the Four Archangels.

Description
As its name implies, Tarmiel's grace of Ocean creates a literal ocean to trap his opponents. This ocean appears to be a plain cut off from the regular world and is inescapable. This ocean is described as the domain of the gods, a space created by the graces. Additionally, Tarmiel's grace seemingly allows him to liquefy his body in order to escape his enemies or render physical attacks as ineffective.