Verdorite

Briargeist (Creature 15), Seetangeist (Creature 12), Waldgeist (Creature 8)

Verdorites are the enraged spectral echoes left behind when an ecosystem experiences a catastrophic collapse. Calling upon the essences of millions of extinguished plants and animals, they punish any they deem responsible for the disaster, as well as whoever might try to harm the lands to which they are bound.

Sometimes druids, fey, gnomes, and other powerful primal spellcasters with a deep connection to a specific woodland ritually sacrifice their lives to the forest, intentionally dying so they can rise as a waldgeist and protect their home for all time.