The Spriggan is a tree-like creature native to the Elder Scrolls, where they are often found in forests and groves.
In appearance, a Spriggan appears to be made of entirely wood and a glowing source that the people claim as magic, they are also claimed to be tree spirits due to the fact that they are always found in areas that feature trees or other flora. There seems to be two variations of Spriggans as some walk on two legs, while others walk on four.
Is there a realistic way that a Spriggan could evolve? Is there a reason that a Spriggan couldn't evolve? What evolutionary factors would support the Spriggan?
A list of all of the Anatomically Correct questions can be found here.