I like to keep an eye for how many xp i earn after killing some bosses, but after hitting level 20, i have no idea how many xp i get :(
For those who haven't reached level 20 yet, the green xp bar at the bottom of your screen disappears after hitting level 20, and you can only check how much left for your next Mote of Light is in the character menu.
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You need to get the light. Then you can start lvling up more. :)