Heroes of Might & Magic franchise 75%-85% off at GOG

https://www.gog.com/promo/2020_springsale_ubisoft

So the base discount is 75% off on the Heroes games. Basically if you buy (or already own) three among any of the titles in the Ubisoft promo then you get an extra 5% off. And at 5 games it's an extra 10% off. So you can get up to 85% off on the Heroes titles. Same goes for the Might & Magic RPG games.