A dryad is mystically bonded to a single, enormous tree and must never stray more than 300 yards from it. Most dryad trees are oak trees, but other trees function as well (often having subtle influences on a specific dryad's personality and appearance). A dryad who moves 300 yards beyond her bonded tree immediately becomes sickened. Every hour thereafter, she must make a DC 15 Fortitude save to resist becoming nauseated for an hour. A dryad that is out of range of her bonded tree for 24 hours takes 1d6 points of Constitution damage, and another 1d6 points of Constitution damage every day that follows-eventually, this separation kills the dryad. A dryad can forge a new bond with a new tree by performing a 24-hour ritual and making a successful DC 20 Will save.