Avabel is your comrade in arms. but you split up because you have different thoughts and ultimately different paths. Avabel becomes a Warrior of Light, while you become a Warrior of Darkness.

after being separated for 300 years, you became a dark warrior slaying everything in your path. Avabel is disturbed by this and intends to exterminate you.

"oh.. turns out my guess was right, it's you. get ready, i will kill you for world peace." he said while holds a sword to his face.