In this Chill Touch 5e spell you make a ghostly, skeletal hand in a space of a creature within range. As per this dnd spell you should make a ranged spell attack which is against the creature to assail it by the chill of the grave. So, on a specific hit, the target would take 1d8 necrotic damage and also it can not regain the hit points until start of your next turn.
Until then, the hand normally clings to the target. But if you hit an undead target, then it also has some disadvantages on the attack rolls against you until your next turn ends.
Did you read about minor illusion 5e spell
At Higher Levels:
This d&d 5e Chill Touch spell’s damage would increase by 1d8 whenever you reach 5th level the damage would be 2d8, at 11th level the damage would be 3d8, and at 17th level the damage would definitely be 4d8.
Attributes Of Chill Touch 5e d&d
|Classes||Sorcerer, Warlock, Wizard|
|Casting Time||1 Action|