God, this is a pain in the ass =P. Alrighty, your basic info here:

Ivan-Who is Ivan and what is so signifgant about him? Find out here.
Ivan's Stats-Ah, I managed to figure out his age! ^_^ Go me!
Templars vs. Heritics-That long, long audcious battle between good vs. evil...and somewhere in between.
Interact-Zombies, annoying people! AH!

If I find any more info on Ivan or anything else to do with "Priest", I will be sure to add it =P