Or, you could create a spell (like in Disciples) that either adds to, doubles, or takes away movement points from enemies. And, like in Disciples, you could summon very powerful creatures (level 10 or higher) to hinder the enemy hero. That is, you summon it, and it blocks the path (the summoning duration is 1, 2, or 3 days, depending on the spell level), and the cursed enemy loses time, while we either escape or gain some other advantage during that time.
And if we really let our imagination run wild, we could create a new skill – something like external Magic and all that, which you can level up to allow you to create a portal to a city – you could choose which city, and so on.