Amphibious. The Vipercrox can breathe air and water.
Bite. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 12 (3d4 + 6) piercing damage, and the target must make a DC 16 Constitution saving throw, taking 12 (4d6) poison damage on a failed save, or half as much damage on a successful one.
Multiattack. The Vipercrox makes two bite attacks.
Poison Breath (Recharge 4–5). The Vipercrox exhales poisonous gas in a 40-foot cone. Each creature in that area must make a DC 17 Constitution saving throw, taking 48 (12d6) poison damage on a failed save, or half as much damage on a successful one.
Opportunity Attack. If a creature moves out of the Vipercrox reach it has an opportunity to make one bite attack.
Description
The most terrifying of all snakes. The Vipercrox. A giant snake with poisonous breath. Vipercroxes use their sense of smell to track down its prey and uses its dangerous bite to paralyze and eat it. A Vipercrox is recognized by its black skin and the red line who begins at the eye and down to the tail.
Lair and Lair Actions
The swamp living black snake sometimes compete for territory with other creatures in the swamp. However, a swamp controlled by a Vipercrox is easy to spot. The swamp is almost empty of other creatures because of the Vipercrox. The snake can't be satiated and can continue to eat because all food is digested immediately. The lair is littered with the acid-pitted bones of previous victims and the fly-ridden carcasses of fresh kills, watched over by crumbling statues. Centipedes, scorpions, and snakes infest the lair, which is filled with the stench of death and decay.
Lair Actions
On initiative count 20 (losing initiative ties), the Vipercrox takes a lair action to cause one of the following effects; the Vipercrox can’t use the same effect two rounds in a row:
- Pools of water that the dragon can see within 120 feet of it surge outward in a grasping tide. Any creature on the ground within 20 feet of such a pool must succeed on a DC 15 Strength saving throw or be pulled up to 20 feet into the water and knocked prone.
- The Vipercrox chooses within 90 feet of it. The cloud spreads around corners and remains until the dragon dismisses it as an action, uses this lair action again, or dies. The cloud is lightly obscured. Any creature in the cloud when it appears must make on a DC 14 Constitution saving throw, taking 10 (3d6) piercing damage on a failed save, or half as much damage on a successful one. A creature that ends its turn in the cloud takes 10 (3d6) piercing damage.
Regional Effects
The region containing a legendary Vipercrox’s lair is warped by ancient magic, which creates one or more of the following effects:
- Water sources within 1 mile of the lair are supernaturally fouled. Enemies of the dragon that drink such water regurgitate it within minutes.
- Fog lightly obscures the land within 6 miles of the lair.
If the Vipercrox dies, these effects fade over the course of 1d8 days.
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