Attune is a part of the Balance Aspect of the Blood Fysa.
This is an active fysa. Users match the rhythms of their body with another's to stabilize an unstable individual, whether it's the user or another person. This can be used to lessen the effects of anxiety, fear, or stress, to relieve insomnia, or to bring one down to resting heart rate after exertion. One can even use it to stabilize breathing, slow bleeding, and help someone close to critical condition.
If you are not a ptheran, this ability also costs a dark blood in addition to other learning costs.