Guardian of Nature

[ Gardien de la nature ]
level 4 - transmutation
Casting Time: 1 bonus action
Range: Self
Components: V
Duration: Concentration, up to 1 minute

Description not available (not OGL).
But here is a summary:

Transform the caster into a Primal Beast (+10 ft, darkvision, ...) or a Great Tree (+10 hp, advantage to some rolls, ...).
Druid
Ranger
Xanathar´s Guide to Everything
  1. DnD 5e Spells › Guardian of Nature