1. Races

Tressym

Tiny Monstrosity, Any Alignment
AC 12
Initiative +2 (12)
HP 5 (2d4)
Speed 40 ft., Climb 30 ft., Fly 40 ft.
mod
save
mod
save
mod
save
Str
3
-4
-4
Dex
15
+2
+2
Con
10
+0
+0
Int
11
+0
+0
Wis
12
+1
+1
Cha
12
+1
+1

Skills Perception +5Stealth +4

Immunities Poison; Poisoned

Senses Darkvision 60 ft., Passive Perception 15

Languages Understands Common but can't speak

CR 0 (XP 10; PB +2) 

Traits

Detect Invisibility. Within 60 feet of the tressym, magical invisibility fails to conceal anything from the tressym's sight.

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.

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.

Actions

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

Source: BGDIA, page 241