How is Dark Messiah connected to Heroes of Might and Magic?

I mean, how can I explain it... Well, look. Dark Elves are like fireflies that were once touched by the magic of Malassa, and because of that, they became different. And Agrail is a Dark Elf who was once touched by the magic of Kha-Beleth. He gained power and the ability to summon demons, but he also changed physically: his eyes glowed, and he became immune to the heat of Shio, etc. But he definitely still has his ears. Look at his helmet. Right at ear level, there are two types of blades, and in reality, they are there specifically for his ears!