There are several skills in the game you can use to either inflict damage or heal yourself. Some are unlocked at certain levels or stat values. Below is an incomplete list that will be updated as abilities are uncovered.
In Combat Skills Edit
This ability requires no Energy to use and does damage based on your strength.
Out of Combat Skills Edit
This ability costs no Energy to use and has a 5 second cool-down. Its effects are currently unknown.
This ability costs 75 Energy to use and has a 5 second cool-down. It heals your character based on your Magic stat.
This ability costs 500 Energy to use and has a 10 second cool-down. It heals your character for a large amount.
This ability costs no Energy to use and has a 30 second cool-down. It restores your Energy and Health to full.