Reading a Book of Wondrous Beasts

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The Caladrius sounds like a manifestation of Shallya, a good description for a healing blessing or helpful effect at a shrine.

also see https://en.wikipedia.org/wiki/Caladrius

The Carestes 'skull in sand' makes it a good Nehekharan desert or Badlands creature.

Hercinia would be found in fey woods

Yena would be found in the Southlands, it is the origin of the leucrotta of D&D (added to my Southlands work)