The additional question is to betray the buyers and stop the sacrifice with his sister and the church? leaving the chalice sealed and saving the sacrifices or allow sacrifice to go through for an unsealed chalice but possibly losing sister's trust?
If you can do all the options at the same time
Both to sell and go to the church
I will give you 5000 coins Next Week
Real men do not Do multiple answers questions
They create the answer in themselves
Well got to say that the smart thing would be to surrender it, but the reader in me say to manipulate the situation. Though I am sure you can write an interesting story either way. I mean the church wouldn't hand it over, right?
he should give item to church... helping the cult seems to wicked considering ge knows the deaths that would incur. Heck it might even hurt his relationships and reputation in the kingdom
He has to consider his reputation with the kingdom. He should talk to his "sister" and makes a plan to set a trap for the demon worshipers. Best case, he finds a different way to unseal the chalice. Libary or von knight family knowledge?
He got a fat cow here in the chalise so he should milk it for all its worth before killing it to eat at the meat. You chose how that happens, but that'd what should happen.