Daemonic Gifts
Any model that has a Daemonic Gift has started along the path to Daemonhood and only Lords close to being Daemon Princes will have several such powers. It is not possible to receive the benefit of any single Daemonic Gift twice.
Daemon Armour
The character's Chaos Space Marine armour has been blessed and sealed by the Chaos Gods and is therefore considerably more powerful. A model in Daemon armour has a 2+ armour save.