Speed 20 ft., fly 60 ft. (perfect)
During Combat The iron archer fires its bow at the nearest creature or at random trespassers. It focuses its attacks on opponents who get past it into the corridor to the exclusion of all others, until the creature is dead or flees. If no opponent gets past it, the iron archer focuses on flying foes.
Morale The iron archer fights until destroyed.
Str 32, Dex 9, Con —, Int —, Wis 11, Cha 1
When the iron archer attacks with its bow, it fires arrow-shaped bolts of energy. These arrows deal 3d6 points of damage on a hit. On the first round of combat, these arrows deal fire damage. On the second round, they deal electricity damage. On the third they deal cold damage. On the fourth round, they switch back to fire and the cycle repeats. If the iron archer ceases to use its arrows (to make a melee attack, for example), the cycle restarts with fire arrows the next time it fires.
The iron archer can see invisibility, as the spell. This effect cannot be dispelled.