Blue crystal

you can overcome earth and water by exploiting their negative reaction to dodging; of course, you can't overcome everyone fairly, but I also attached two more (fire and air) to the battles, and I and the elemental troops have many more troops.

You can fight with incomplete troops as a mage, because you are a warlock, but what will an elf or a knight do with a group of troops - nothing. With elves, berserk doesn't reflect off enchanted arrows, which is good).