Flying units in Heroes 2.

Ideally, the hero should be decent, preferably a Knight with stats like 6-7-2-2. A simple Necromancer with stats like 1-0-3-3, without Animate and with 90 skeletons and 4 dragons, will suffer heavy losses. You'll have to take down the Black Dragon in 3 hits.
Colored dragons might have low morale, and a pair of gargoyles might flap their wings downwards.