Amphibious. The worm can breathe air and water.
Blood Frenzy. The worm has advantage on melee attack rolls against a creature that doesn't have all its hit points.
Many Mouths. At the start of each of the worm's turns, it deals 9 (2d8) piercing damage plus 9 (2d8) acid damage to each creature that is grappling it.
Bestial Subtype. This creature is bestial, meaning the spells animal messenger, beast bond, beast sense, locate animals or plants, and speak with animals affect the creature as if it were a beast.
Multiattack. The worm makes two bite attacks. If the worm is grappling a creature with blood, it can replace one of the attacks with its Blood Spray action.
Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 16 (3d8 + 3) piercing damage plus 13 (3d8) acid damage, and the target is grappled (escape DC 15). Until this grapple ends, the worm has advantage on bite attacks against the target, it can't bite another target, and at the end of each of the worm's turns, the target takes 13 (3d8) necrotic damage due to blood loss, and the worm regains hit points equal to the damage dealt.
Blood Spray (Recharge 4–6). The worm sprays toxic blood from its mouths. Each creature within 30 feet of it must make a DC 15 Dexterity saving throw, taking 13 (3d8) acid damage plus 11 (2d10) poison damage on a failed save, or half as much damage on a success.
Description
The gigantic fiendish leeches known as stygian worms are appropriately native to the River Styx that stretches across the Lower Planes. They can be found in greatest abundance in the jungles of Carceri, but some claim to have even found the worms in the festering pools of the most foul jungles, swamps, and caverns of the Material Plane and the Shadowfell. These worms seek to latch on to powerful fiends and drain them of their magical blood, but will happily attack and consume the blood of any smaller creatures that wade into their waters.
Devils, demons, and yugoloths are not the only creatures native to the lower planes. All manner of wild beasts live as fiends among the lower planes. Some of them, such as the canine hell hounds and the equine nightmares, are well known to adventurers, while others are more enigmatic. The following fiends are native to the lower planes but live like wild, feral beasts.
Sometimes, these fiends can be summoned into the Material Plane or other planes. In rare cases, a group of wild fiends can find suitable environments to reproduce in another plane, and a small population may begin to live there, such as in a hellish volcano, poisonous jungle, frozen wasteland, or death-choked hollow.
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