Nemesis is a really cool thing. At first, I didn't pay much attention to it. But in one final battle, I let the computer control the battle using the "autobattle" option, and when I saw how the dragons flew up to the enemy, breathed fire once, and took down 3 or 4 enemy stacks in one go, I couldn't believe it. Then I read about the Nemesis's abilities in the descriptions, and it's true; it can take out several units standing next to each other at once. By the way, this specific feature of the Sylvan faction is the best. Other factions have all sorts of retraining options, spells, etc., but nothing even comes close to it. IMHO. "Heroes with the 'Avenger' skill can turn several opponents (the number depends on the skill level) into 'Nemesis' enemies. In order for a creature to be included in the list from which you can choose 'Nemesis' enemies, you need to kill a number of these creatures that exceeds two standard weekly growth rates. 'Nemesis' enemies take additional damage, similar to a 'lucky strike'. Also, some skills allow you to attack all 'Nemesis' enemies on the battlefield at once."