[@Riffus Maximus]

Awesome. A weirdly cleric esq character for a dark and mysterious being. He certainly has a unique role for the cast. His job, for Lancelot's sake specifically, should be that of the cleric. Only instead of healing characters he is responsible for making sure that a valuable Knight of Evil stays in commission, should they die. However, he has the freedom to choose whether or not he me give the fallen comrade a second chance. 

One of the problems I have this character is that there doesn't seem to be an exact limitation for the res ability, and while I like both abilities to reconstruct people that have been erased from existence as well as being brought back to life; I don't want the risk of death to be completely removed from the game.

First I'd limited the res abilities to apply only to entities with mortal souls or similar. Characters based off demons and similar entities can not be brought back in the same way (Since they were never really alive or dead to begin with) as well as undead based characters (Since they already weren't alive.) 
Another limitation I'd recommend is that a character can only be brought back once or twice, and cannot be brought back by the same means again.

His mastery over death I think could use a bit more to it. For instance, I'd like to see an additional ability that allies the direct manipulation of spirits and curses retaining to death; Giving him curse removals and being able to deal with say a poltergeist or haunted house by giving them a properly funeral. (I think you already elaborated that he could do that, but I'd like to see this being able as an offensive ability against such unique opponents.)

As for the Hour Glass artifact, if you don't have any ideas for it I have a few.
-A talisman for spirit channeling
-A charm that can protect a target from death (Not directly, but from death spells that affect mortals. E.X. A theoretical ability similar to death note used on a target wouldn't work if the target was charmed with this artifact.)