dude as i know so far you cnt do it.but you may replace your triggering unit with onother clone unit but with different armour type.Offcourse this can be done via triggers and you need to createe both f units with object editor
hope it`s useful
You could make an identical unit to the one you're trying to edit, and when something happens to that unit, for example let's say if it died or was attacked by a certain monster, etc., that you could remove that unit from the game and put in the identical one that was given hero armor.
Example:
Event:
Unit is attacked
Condition:
Attacked unit equal to Yourunit
Action:
Replace Attacked unit with YourUnit using the Old Units life and mana.
I do know this - xenforo dropped the ball by not keeping the vbulletin reputation comments as a feature. The loss of the Reputation comments data when we switched to Xenforo really was the death knell for the site when it came to all the users that left. I know I missed it so much and I got way less interested in the site when that feature was gone and I run the site.
I'm on a page about incorrect corrections, and spent the better part of like two hours trying to get someone to understand that -5^2 = -25, not 25, and then that post had comments get reposted because that group is self sustaining, and that person was in turn trying to explain what I just explained to them. And I'm taking that as a victory