[quote]level 21 light, anyone know how to level up to level 25 or more?[/quote] At or around level 20 you will start acquiring armor of Rare or better rating with the "Light" attribute. Light is increased by upgrades to the Defense rating. Legendary armor has inherently more light while exotic and raid armor hold the only path to level 30, event armor (Ex: Iron banner) may also contain light higher then normal. 30 light in all armor pieces is required for lv 30.