Some traits you can pick to replace the "Dragon Breath" icon - such as Evil Eye - these are attack abilities and clicking on them during a battle will unleash their power.
Other traits just happen. If your character has the Crusade trait they automatically get more experience any time they are fighting against undead monsters.
Still other traits are needed to be able to repair items or identify items - both of these uses are done while in your inventory window.
Hope that helps!
Wyv
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