Tressym

Tiny Monstrosity, Any Alignment

STR
3 (-4)
DEX
15 (+2)
CON
10 (+0)
INT
11 (+0)
WIS
12 (+1)
CHA
12 (+1)
Detect Invisibility.

Within 60 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.

Familiar.

With the DM's permission, a person who casts the find familiar spell can choose to conjure a tressym instead of a normal cat.

Actions

Claws.

Melee Weapon Attack: +0 to hit, reach 5 ft., one target. Hit: 1 slashing damage.

Find this creature in the encounter builder

Tressym

Source: Baldur's Gate: Descent Into Avernus, p. 241 - Licenses and attribution