Starling Familiars AKA M.U.S.E.'s
(mystical and unstable spirit essence)
​

Animals - Hybrid (Horse + fish, etc)
Weapons- Each familiar can 
transform into any unique item,
plus the Starlings wings.
Others who have these familiars,
but aren't Starlings, usually 
create items pertaining to 
their craft.

Background: Lyra created a familiar system, where a special fountain forms crystalized nebula eggs. Within them, elementals are summoned and appear as two different animals, or hybrid. New species were create all the time depending on the Starling or Starfallen Elf.
These creatures served as a Starlings "Conscience" to help them make judgement calls while out on patrol.