Chimera Cat

Keen Smell & Sight. The cat has advantage on Wisdom (Perception) checks that rely on smell or sight.

Shadow Teleport (Recharge 4–6). The cat magically teleports, along with any equipment it is wearing or carrying, to any shadow it can see. Before or after teleporting, the cat can make one steel claw attack. The cat can choose to stay inside of a shadow making it immune to nonmagical damage but it cannot stay in a shadow for more than 10 minutes.

Growth. Once per long rest the cat can grow to the size of a medium dog for up to 1 hour a day, during this time it gains +2 to all attack & damage rolls but suffers a -10ft to its tremorsense.

Limited Telepathy. The Cat can magically communicate simple ideas, simple words, emotions, and images telepathically with any creature within 80 feet of it that can understand a language.

Lesser Bag of Holding. This cat has been fused with a bag of holding with an interior space considerably larger than the Cats outside dimensions, roughly the same in diameter as the cat's side and 5 inches deep on the side of the cat. The cat can hold up to 150 pounds, not exceeding a volume of 40 cubic feet. The cat weighs the same, regardless of its contents. Retrieving an item from the bag requires a bonus action.

Steel Claws. Melee Weapon Attack: +1 to hit, reach 5 ft., one target. Hit: 1d6+1 slashing damage.

Sneak Attack. Once per turn, the cat can deal an extra 1d6 damage to one creature it hits with the Steel Claws attack if it has advantage on the attack roll. The Cat doesn’t need advantage on the attack roll if the enemy target is within 5 feet of it. If that enemy is incapacitated, you have advantage on the attack roll as well.