Political prisoner with a growing piety.
Although Ivan claims he is an heir to Tsar Igor the Iron Fisted’s throne, he does not use this as a boast. He conducts himself as someone biding his time. Killed by undead during the the battle of the Vault.
Being one of two surviving prisoners has lead Ivan to believe he has the favor of his ancestors. This religious devotion is expressing itself with greater and greater abilities to grant clerical blessings.