Flying units in Heroes 2.

Well, the answer is quite obvious. But you need to add it with standard Necromancer or other hero parameters and without the "Animate Dead" spell. Because a powerful hero will take it without losses and with skeletons.
And I didn't quite understand what a non-standard build for a Necromancer is. It seems like, besides 5 (4) armies and 4 upgrades, there's nothing else to build. Do you mean the well?