Finwicket's Bestiary: Along the Faerie Path (2011)

From publisher blurb:

Join gnomish explorer and esteemed expert in biology, Thaddeus Finwicket, as he reveals hitherto unknown creatures from the Realms of Faerie. After a six month-long expedition into the storied woodlands and haunted knolls, the good professor has returned with tales that would impress the most cynical and hardened adventurers.

• Faerie Seer- Mysterious and enigmatic, Faerie Seers are consummate diviners. They never give up their secrets without a price.
• Harvest Haunt- Scourge of farmers everywhere, these wily fey utilize the abundance of the harvest to perpetuate their numbers.
• Thin Man- As assassins of the fey courts, Thin Men are rarely spotted before it is too late. Rumors suggest they are heralds of something horrifying, a menace that lies far beyond the ken of sanity
• Spindler-A fey tailor with a taste for style and an unremitting urge to force his products on others.

Finwicket's Bestiary: Along the Fairy Path also includes an extensive overview of the Faerie Realm and information on how characters may travel to those storied lands.