XP Levels and rewards
Level rewards are claimable under the "Perks" on your character's profile. Several more levels will be added in the future. If your character levels higher than the currently available rewards, they'll be able to claim any new rewards retroactively once they're released.
Level 1
+2 breeding slots
+1 spell slots
+50 
Level 2
+2 breeding slots
+1 spell slots
+2 XP
+1 might
+1 charisma
+1 dexterity
+1 arcana
+50
Level 3
+2 breeding slots
+1 spell slots
+2 XP
+1 might
+1 charisma
+1 dexterity
+1 arcana
+50
Level 4
+2 breeding slots
+1 spell slots
+2 XP
+1 might
+1 charisma
+1 dexterity
+1 arcana
+50