Uninvited guests.

This isn't the first map featuring heroes with unconventional specializations, and I've never seen them available for recruitment in taverns. The Warlock's "Immolate" ability is frustrating because it only targets units on the edge of the map. When the enemy has a lot of single-cell units (not archers), they are usually positioned on the second row. And if the enemy employs a specific tactic, even their tougher units are moved forward. Also, at the beginning of the game, when he casts only one wall, it's often placed not on the units, but between them. It would be helpful to somehow tie the wall casting to the enemy's troops.