Some heroes can enchant other heroes, both in a positive and negative way. Some of them need to hit another hero to enchant them, some enchant nearby heroes instead. If your hero is enchanted, you will see an enchant effect around them on the battlefield. To see the details of the enchant, tap on the hero card and see the section below your hero stats. The hero can be enchanted by just one enchantment at a time - new enchantments take over the previous one.