Purple worm poison

injury (venom) - 2000 gp
VenomThis poison must be harvested from a dead or incapacitated purple worm.
A creature subjected to this poison must make a DC 19 Constitution saving throw, taking 42 (12d6) poison damage on a failed save, or half as much damage on a successful one.
Dungeon Master´s Guide
  1. DnD 5e Poisons › Purple worm poison