Lord Foul.
Going by this part right here:
Foul has an inherent power over the undead, able to perfectly enslave any who violate the Law of Death.
Yusuke was dead when the series started off, though the first story arc focused on him earning his resurrection. Towards the end of the series, he died again, only to come back again, this time thanks to his latent demonic heritage, which REALLY surprised everyone. If the first incident didn't violate the law of death, the second almost certainly does. Advantage goes to Lord Foul...
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There never was a post. Swamp gas from a weather balloon was trapped in a thermal pocket and refracted the light from Venus.