We are clearing out the neutral creatures.

Excellent strategy for clearing neutral creatures to gain experience for mages. Take Razaz, upgrade the Gremlins (specifically those that repair golems), and then send the golems to the center of the map to attack the neutral creatures, provoking them to attack each other. Meanwhile, the Gremlins and the hero (and possibly a ballista) eliminate the neutral creatures. By the end, after repairing the golems, the battle is won without any losses. It's a good idea to split the Gremlins into several groups so they can repair more frequently. And when you have 10 mages in your army after 2 weeks, everything becomes even easier. Against archers, if you're lucky enough to learn the "Wall of Fire" spell, deploy only Obsidian Golems, cast "Wall of Fire," and run along it.