Aspects
There are four aspects: Awareness, Fitness, Focus, and Spirit.
Your Ranger's aspects are printed on their aspect card.
During Phase 4 of the round, Refresh, add energy tokens to your energy pool until you have a number of each energy type equal to the corresponding aspect value. At this time, if you have energy tokens in excess of any of your aspect values, you must discard the excess tokens.
During Phase 2 of the round, Player Turns, you can have any number of energy tokens in your energy pool. You are not limited by your aspect values in this way.
Your aspects determine which cards you are able to include in your deck. Each Ranger card has an aspect requirement on the lefthand side of the card. You can only include a card in your deck if your corresponding aspect value is greater than or equal to the requirement.
Thematically, aspects represent your Ranger's inherent characteristics.