Is it possible to change the availability of an upgrade with triggers? My idea was to make it possible for a player to choose to which unit he would like to upgrade a certain unit (like the Berserk upgrade).
Example: The basic unit is a Sorceress. And now you can choose whether you'd like to upgrade her to a Whitch (adds some more spells) or a Summoner (able to summon various units).
Example: The basic unit is a Sorceress. And now you can choose whether you'd like to upgrade her to a Whitch (adds some more spells) or a Summoner (able to summon various units).