Alder, Last Guardian of the Forest
Alder was at one point, a normal Alder maple tree. After the first collapse of the world, he woke up to the suffering of the cratures of the forest. With his newfound empathy for the other denizens he becomes a forest elemental.
During the dream that the Mindflayer built for the survivors of the cataclysm, Alder was a small, halfling cleric.
He fought in The Nothing War against the Deep before returning to the forest in peace to assist its restoration.