The double adamantine doors are 40 ft. tall and cannot be damaged. They are barred from the other side. They can be forced open by characters with a combined Strength of 200 or more; no check is necessary if the group are strong enough, but no more than a dozen humans can attempt the task at once. If the heroes lack the combined strength, they will have to find another way in—through the flooded basement.
The Griffons flying around the tower nest in many places on ledges and in window openings. They are aggressive towards anyone who tries to approach the tower by air. Someone using flight will be swarmed by 7 (2d6) griffons. In addition, the Fallen Star (area S37) illuminates any flying creatures trying to gain access. If the first group of griffons are defeated, the light summons another swarm after 2d6 rounds.