The Worm Bridge
Hazard
Level 10 Elite Obstacle
XP 1000

The gaping maw of an enormous undead purple worm forms the entrance to a covered bridge across troubled waters.

Hazard: This hazard consists of a 2-by-2-by-2-square space occupied by the purple worm’s head. A creature can freely enter or exit the area, but it does so at its own peril.Perception     DC 18: The character spots movement in the purple worm and realizes it is undead.Arcana     DC 21: The character recognizes the danger of the Worm Bridge, knows its effect, and understands its countermeasures.Initiative +5TriggerThe worm bridge attacks any creature not given permission to cross it by Bragarra. It attacks when a creature enters or leaves its head’s space, and it attacks any creatures within 2 squares of its head’s space on its initiative count.AttackStandard Action or Free Action      Melee
Target: The triggering creatureAttack: +17 vs. ACHit: 2d6 + 5 damage, and the target is pushed 2 squares. A creature pushed behind the head is moved into its body, a 2-square-wide tunnel of dead flesh. Creatures in the body lack line of sight and line of effect to creatures outside the body. Damage dealt to the body does not harm the head (but it might let the Lathan in).Countermeasures     Athletics DC 21: A character in the head’s space can use a standard action to attempt an Athletics check. On a success, the character can either keep the mouth open or closed. Either way, the Worm Bridge cannot attack until the end of the character’s next turn.
     A character can attack the Worm Bridge’s head (AC 24, other defenses 22; hp 220; resist 10 necrotic, resist 5 all). When the head is bloodied, it loses the ability to make attacks on its initiative count.

Published in Underdark, page(s) 131.