Wizard – “Hope of Zephyr” [Campaign 6, Mission 5]

Exile is not a spell, but an ability from the summoning magic school. I don't remember how it was in the 1.x versions, but in the 3.x versions, each of these heroes can acquire it. However, in 3.x, it's practically useless.

In version 1.0, Exile was available to Mages and Necromancers, although it was harder to obtain for the latter. Back then, it was a powerful ability, a real game-changer. That's why it was easiest to win the final battle of the last mission with Zehir.