Agree with Haman. I dont see any reason to buff the Armor of Mass Slayer Heros.
Gandalf and Saruman have once lvled slightly up with their first magic attacks they have a good amor. It is really not difficult to lvl them up to 10.
Regarding Zaphragor: In the following im gone make me a lot of enemies and im already sry for the people who out their work&time in this hero, but its my opinion. Zaphragor is the Hero i hate the most in Edain. Yes his mechanism is cool but thats the only think i like of him. His Position, Role and Design dont fit into the Tolkien-Angmar. With his abilities he outshines the Witchking enormously. Say so: Zaphragor is the Gandalf of Angmar. The attack mechanism of his first ability is also different than the magic blasts of the Saruma&Gandalf. It deals damage to the hole surrounding of the hero, not only infront of him. That makes the attack better than magic blasts, its like a small "word of power"
.
Now like Haman said his nice mechanism to get stronger melee when dying puts him into more Hero positions than just a mass slayer. That double role of Angmar Heros, not only Zaphragor, is a serious problem in my eyes.
Last but not least the cooldowns of his abilities are a joke.
My opinion is to cancel this hero, Angmar does not need a mass slayer Hero like Zaphragor, they already got the Witchking with Mass-Slayer Attack Moves, they got wraiths, they got Werewolves, they got Witchers
Instead: rework the Witchking of Angmar and give him an extraordinary Role in his faction: Keep his Mass-Slayer Attack Moves, give him some outstanding lvl. 10 Ability: Should not necessarily be the "Word of Power of Angmar" from Zaphragor. Maybe something "Tolkienish": Remember maybe the at the battle of Fornost, the scene with Earnur and his horse. Yes Glorfindel banished him, but what about an ability with special effects against Mankind? That would emphasize the history of both factions, especially summoned in such an important figure.