Four Sisters under the same mentor, Learns the ways of becoming skilled Mesmers.
From left to right.
Ezriall Featherfade: Timid, very jumpy, has a sad demeaner.
Raziell Feathermane: The comforter and caring
Zariell Featherveil: Aggressive, ready to brawl and snuff out anyone that gets on her bad side.
Azriell Featherfluff: The Bubbly, half glass full type.

All 4 possess an amulet passed down from there Mentor. This amulet has special recording properties that the mentor has recorded thoroughly all the species of Tyria. Thus when used with a Mesmer can change certain properties of the wearer temporarily (more explicit explanation in art to come)
Each one uses it for there own pleasures.

Ezreall managed to use it onto others over herself.
Raziell managed to master its Realistic/practical uses.
Zariell mastered the amulet to its fullest making hybrid conjures and very extreme sizes.
Azriell learned to use it in very unconventional ways