Treants are naturally strong, but rather slow of foot. Their bark offers them a great measure of protection from physical damage, but leaves them more vulnerable to fire.
Treants are normally a solitary, peaceful people, but have come into conflict with humans. Some of this is normal greed for the Treants' woods, but some of it is due to the fact the Treants' bark can be crafted into magical items.
Treants may grow large enough that they are capable of striking close foes all at once, typically with a giant foot, or massive branch.
(Source: Magic Stones)