Verzhak’s company is on the champion.

I completed the campaign on champion difficulty. In the first mission, I used the described strategy of acquiring the necessary potions from the shop: "Hellfire" and a potion that lowers morale. I defeated the first pirates with a 2-1-3 formation, then gathered troops from the buildings again and attacked Tomi Creek, leaving only Verjak and 24 centaurs: in this battle, you need to separate the individual centaurs, use the main centaur stack to shoot at the pirates in a straight line (let them get close enough), throw the morale-lowering potion at the pirates, and then it's easy, as the guards of the neutral cities switch to our command. After that, the campaign is easily completed with the help of the immortality potion.