What is a good idea to convert a unit?

[stan0033]

Hi everyone, I am makign a map in whichI want to make a unit be able to be converted t onotehr unit if certain builsings are present like Sacrifice(undead), call to Arms(human), Destroyer(undead).

I want to make a Priest turn into a Paladin(non-hero) for 150 gold and 20 lumber. When you click the ability he goes to the nearby Arcane Sanctum and 'trains'

Any ideas how to do it?

 

[Hermit]

Undead "Sacrifice" ability

 

[Zepher]

From what I read I believe that you are trying to make the unit go to a specific building to "train" to become a different unit. Maybe a permanent call to arms? But the unit will get transformed instantly, sacrifice on the other hand takes some time before the unit is transformed.