Azmadon
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The fact that any Hero can use Runes is understandable, but they should be usable on all units (and in our case, we'd like them to be).
As for Minions, a Mage can only equip them on creatures from the Academy (although he can then easily pass them on), but he can't, for example, equip them on Skeleton Warriors or Archers and give them to an ally.
In both cases, we'd like to be able to bypass this restriction. A Rune Priest could use Runes on, for example, Elven Archers serving in his army. A Mage, like a Smith of Artifacts, could supply not only his own army but also the armies of allies with his Minions, giving them to, say, "Liches" and "Adept" units.
As for Minions, a Mage can only equip them on creatures from the Academy (although he can then easily pass them on), but he can't, for example, equip them on Skeleton Warriors or Archers and give them to an ally.
In both cases, we'd like to be able to bypass this restriction. A Rune Priest could use Runes on, for example, Elven Archers serving in his army. A Mage, like a Smith of Artifacts, could supply not only his own army but also the armies of allies with his Minions, giving them to, say, "Liches" and "Adept" units.