Sealing Spike

The sealing spike is what holds back The Imprisoned in Skyward Sword. It is located in the Sealed Grounds. It is assumed to be destroyed when Link wishes for the destruction of Demise, which causes Sky Keep to fall onto the sealed grounds; more specifically, the Imprisoned, which had been in the process of escaping.

Usage
The sealing spike acts both as a weak point for The Imprisoned and as a target to temporarily reseal the Imprisoned after each battle, through a sequence of slashes(in a different pattern for each battle) following a skyward strike.