From publisher blurb:
Welcome to Deadly Gardens: Yggdrasilar. We are excited to bring back the normal installments of the Deadly Gardens series, which has been on hiatus since the release of Deadly Gardens: Verdaxag, King of Trees, in 2017. Please look for additional Deadly Gardens releases in the near future.
Deadly Gardens is a series of short PDF documents featuring a brand new plant monster to use in your Pathfinder First Edition games. In addition to a new plant monster, each volume also features natural items related to the creature and how to use them as natural power components for spells. Also included is supplemental material such as equipment, hazards, ailments, feats, or spells that all involve the theme of plants or nature.
In this volume, we present the mythic power of the Yggdrasilar, planar guardians that roam the branches of Yggdrasil the World Tree and prevent intruders from crossing into other planes. Please note that the Yggdrasilar are mythic creatures and use powers and abilities from the Pathfinder Roleplaying Game: Mythic Adventures book from Paizo.