From the introduction:
An unlucky dryad, protesting the over-logging by a group of human settlers, is captured by human foresters and held captive by threats to her tree for weeks. Eventually, mind broken by the experience, the creature used her druidic powers and the unknown aid of a powerful demon to escape her captors, slaying some and twisting others into hideous, maddening forms. Calling on her druid powers, which have been twisted by the corruption of her bonded tree, she awakens the animals, plants, and even vermin of the forest around her, growing them into unnaturally large shapes and granted a few of them intelligence. She also has drawn the fey creatures of the forest to her, inadvertently infecting and twisting them with her own madness and hatred for humanity. Between her growing army of awakened and twisted creatures, as well as her growing druidic powers, she is becoming a large threat to the frontier region. Her desire for revenge and her growing madness have caused her to strike out towards the nearest towns, causing them to seek aid against the sudden, frightening menace that threatens their very survival...