What impressed me the most were the Succubus creatures; when they seduced my unicorns, I had to replay, and now I'm afraid of them. In general, the upgrade for the Demons is pretty good, and even at level 6, it's a pity they removed their magic :( (although, considering that I mainly play against Demons and not as them, it's actually good for me :D ;) ). I also think the horses were done well; the Demons and Arch-Demons with their movement can cause quite a bit of trouble... In short, as a player who often fights against Demons, I don't want to get too close to the new Inferno upgrade in battle :D :)