From LSWiki

Class: Esoteric Skills

Attribute: Perception
Pedagogy: Procedural
Hidden Skill

One of the four power control skills, which deal with one's ability to 
make use of sources of power which respond to one's will.  This skill 
determines how well one can direct the energies generated through such 
a source, ensuring that they go where one wants when one wants.

See Also: Power Generation, Power Focusing, Power Tuning

Notes

Trainers

Northlands: Farouzh wanders (only trains bezhuldaar)
Tenereth's Rest: Zid
Association:
Kazarak/Kazarzeth: Urdo Wanders
Guild:
Ringwielders: Merethus
Quest: