Archibad Scientus
A skeleton that always comes up after its destruction? Hmm ... That's strange. This does not seem to be the work of an alchemist who used the corrupted therianic energy. You say that the creature has no signs of intelligence? So, yes, there is probably an ancient ritual behind this "curse". Obviously, it's a matter of speech, everyone knows that divine disapproval does not exist in reality.
There is a way to break the spell, but this requires many ingredients. Bring them to me and I will make you some incense necessary to negate the spell.