There might be some spoilers. This short guide explains how to complete level 16 in the Hero’s Hour game.
Guide to Beat Level 16
On level 16 get 3-4 Wise and dump the rest of the money into Trogs.
Place the Trogs in front and the Wise behind them, i placed them a bit further away from the enemy army to have time for the cast before the spiders rush you.
Start it and let the Wise cast, if they cast Evolve on your Trog horde you win, if not restart the battle.
It might take a few restarts because sometimes they just keep casting Chaos. You beat 25 the same way.