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Medium monstrosity, unaligned
Petrifying Gaze. If a creature starts its turn within 30 feet of the basilisk and the two of them can see each other, the basilisk can force the creature to make a DC 12 Constitution saving throw if the basilisk isn't incapacitated. On a failed save, the creature magically begins to turn to stone and is restrained. It must repeat the saving throw at the end of its next turn. On a success, the effect ends. On a failure, the creature is petrified until freed by the greater restoration spell or other magic.
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) piercing damage plus 7 (2d6) poison damage.
Travelers sometimes find objects that look like pieces of remarkably lifelike stone carvings of wildlife. Missing parts appear to have been bitten off. Seasoned explorers regard such relics as warnings, knowing that the basilisk that created them is likely to be nearby.
Adaptable Predators. Basilisks thrive in arid, temperate, or tropical climates. They lair in caves or other sheltered sites. Most often, basilisks are encountered underground.
Gaze of Stone. Basilisks are ponderous for hunting creatures, but they needn't chase prey. Meeting a basilisk's supernatural gaze can be enough to affect a rapid transformation, transforming a victim into porous stone. Basilisks, with their strong jaws, are able to consume the stone. The stone returns to organic form in the basilisk's gullet.