Xiao was a greatest dark mage villain that ever live and everyone was afraid of him because Xiao can manipulated his dark powers to everything he wanted.

Aether was a new light hero. he was very clumsy and make himself get bullied by some villains and heroes. his mission just need to defeat Xiao

when Xiao and aether met:

Xiao: so your the kid that gonna fight with me, huh? i'm telling you kid, i'm not gonna lose.. Xiao said on sarcastic tone