Who is the most evil character in Warcraft history?

[Kyveli-aerie-peak (Kyveli)]

@Drahliana-earthen-ring

That’s why the contention for top spots are Gul’Dan, Arthas, Adelas Blackmoore, Kael’thas, and Kel-Thuzad.

Can you really lump in Kael’thas when he’s apparently capable of being redeemed?