Gain a +3 your constitution or a +3 to charisma. Added bonuses can be equaled out like +2 Constitution with +1 charisma.  Outside of battle Alessandra cannot be seen by anyone other than the linked partner for they are in the spirit realm but during battle they are physical and can be seen.

When a player puts on the amulet of Alessandra, the player will be linked with the spirit. When linked the player gains +2 to any stat of choice(CANNOT GO OVER 20)and can use telepathy to communicate with each other. Also any damage the player takes will be taken out of the Alessandra's hit points. Alessandra cannot be killed this way but is instead unconscious for 6 turns and is then revived at half it's maximum hp but if the linked player dies so does the Alessandra. Alessandra has to be within 30 ft of linked partner or they are transported back to the linked partner.

 Alessandra's cannot heal normally but heal when there linked partner long rests. 3D4+linked player level, this can be done every long rest(extra hit points don't convert to temporary hit points)