Wyvern poison

injury (venom) - 1200 gp
VenomThis poison must be harvested from a dead or incapacitated wyvern.
A creature subjected to this poison must make a DC 15 Constitution saving throw, taking 24 (7d6) poison damage on a failed save, or half as much damage on a successful one.
Dungeon Master´s Guide
  1. DnD 5e Poisons › Wyvern poison