From LSWiki

Class: Esoteric Skills

Attribute: Willpower
Pedagogy: Procedural
Hidden Skill

The ability to control the power, from whatever source one may have it, to 
alter one's own form.

Notes

Trainers

Association:
Synodia Lykouros: Karth the Elder 
Guild:
Shapeshifters: Maramar (<=250)
Quest: