In order to gain a Darkside, you need to be exposed to a Fallen Dark knights soulstone or indoctrinated into the Darkside.
As seen in the class quests, the WoL is exposed to the soul stone, while Sidguru is an indoctrinated DRK.
As seen in the class quests, the WoL is exposed to the soul stone, while Sidguru is an indoctrinated DRK.
"You can either take your time to understand who I am and what I am OR you can die. Horribly. Your choice." - Sarnai Kha