Anyhow here it is:
Plot Summary: The demon prince Orcus (antagonist) is trying to re-open the rifts to his unholy Shadowfell sites where he was imprisoned and release his undead army to enslave the living creatures in the world and have them bow before him as the only god. He needs a magical human skull to accomplish his mission. There is a small band of holy priests who call themselves the Shadow Breakers that are aware of the demon's intentions and have dedicated themselves to stopping Orcus's plan.
Plot World Location: Nentir Vale
Exposition : While traveling with the Dwarf merchant Traveus, the party is attacked by a band of goblins who steal a small locked wooden box from Traveus. As the goblins retreat, the party notices a cloaked rider in the distance who seems to be in charge of the goblins. Traveus promises gold if the adventurers retrieve it for him and promise not to look inside.
Rising Action: The adventurers learn the contents of the box contains a magical human skull and the threat it poses to the world. They are not fully aware of who the antagonist is but they feel his presence in many happenings and notice his agents show up everywhere. They lose the skull and must decide if they choose to find it to save the world.
Conflict: The adventurers discover who Orcus is and what his plan is. They learn the skull is of a powerful wizard that closed the rifts and trapped Orcus. As the last rift was closing, Orcus killed the wizard and imprinted some necromatic magic on the wizards body that would allow Orcus, through his priests, to resurrect the wizard as his undead slave so he can re-open the rifts , as the wizard was the only one who knew how to undo his magic.
Climax: The adventurers track the skull to a clearing in a mountainous region where Orcus's priests are performing a ceremony to raise the wizard. Orcus's minions delay the adventurers long enough for the priest's to raise the wizard who manages to open a rift and release Orcus.
I know the plot is probably old and tired but my players have never played so it will be fresh to them.
Thank you for taking your time to read this post.