I'm remaking "Espers". I need to have shared cooldown in order to make some kind of new "game-play" that is something different, new and original for the campaign as well as in the whole Warcaft 3.
There are five abilities, they all must have same cooldown(shared cooldown). The cooldown is short, and meant for the player unable to spam abilities(otherwise player would just spam all his abilities at the beginning of each fight killing normal enemies too quickly). The espers will have always 1000 maximum mana and huge mana regeneration forcing the player to use Espers' abilities frequently, but tactically.