A tressym was a magical beast resembling a small winged cat. They could be found across the warm and temperate lands of Faerûn, and were most common in northern Cormyr, particularly in the village of Eveningstar where they were seen as good luck charms and mascots and praised for keeping down rodents. They were also popular as familiars for good wizards.
Detect Invisibility. Within 50 feet of the tressym, magical invisibility fails to conceal anything from the tressym's sight
Keen Smell. The tressym has advantage on Wisdom (Perception) checks that rely on smell.
Poison Sense. The tressym can detect whether a substance is poisonous by taste, touch, or smell.
Claws. Melee Weapon Attack: +0 to hit, reach 5 ft., one target. Hit: 1 slashing damage.