Unused dialogue from Ingward suggests that the player was supposed to fight "a Darkwraith, a servant of the Four Kings" before obtaining the Key to the Seal.

This dialogue may refer to the Undead King Jar-Eel, a cut boss from the game, as one of King Jar-Eel's weapons is a Dark Hand, which is used frequently amongst Darkwraiths.
Contributed by ThisGuyInTheSuit