Cacthan

Keen Smell. The cacthan has advantage on Wisdom (Perception) checks that rely on smell.

quick learner. The cacthan can observe a creature speak for 10 minutes and can talk the basics of the language.

magic attacks. The cacthan's attacks are magical.

 Inhabit body. The cacthan can transform into a spectral version of it self for 1 minute, while in this form the cacthan has resistance against bludgeoning, piercing, and slashing damage from nonmagical weapons, as a action the cacthan can jump into a body of a small or medium humaniod, when the cacthan does this the host must make a constitution saving throw 17DC, the target fails automatically the save if the target allows it or if the target is unconscious, on a fail the cacthan inhabits the body of target, the host doesn't notice the cacthan in it body unless detect magic spell is cast on host, while in the body the cacthan can talk telepathic with the host, the cacthan can give the host some cat features and give the host new ambilities while in this form, and the host can only use them when the cacthan allows to, the host gain the following changes:

• The host grows cat ears, cat tail, nose, whiskers, and cat claws.
• the host Has adventage on perception checks that rely on smell.
• The host can speak any languages that the cacthan knows.
• the host becomes immune to the petrified condition.
• the host gains a magical natural attack with cat claws 1d10 slashing damage.
• the host becomes vulnerabile to psychic damage.

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

Sleep cloud. The cacthan releases a cloud Every creature that is within 15 feet of the acthan must make a constitution saving throw 13DC, on a fail the creature falls unconscious for 1 minute.