Shadow Hand

By sending 2 Ki points, you are able to cast a modified version of the second level spell: Shadow Blade as defined below:

SHADOW FIST

• Level:   2nd
• Casting Time: 1 Bonus Action
• Range/Area: Self
• Components: S
• Duration: 1 Minute
• School: Illusion
• Damage/Effect: Psychic

You weave together threads of shadow to which wrap your fists and feet. 

For the duration of the spell, Unarmed Attacks deal 2d8+WIS psychic damage on a hit. In addition, when you attack a target that is in dim light or darkness, you make the attack roll with advantage.

Martial Arts Progression. At Monk level 11, when you cast this spell, the damage increases to 3d8+WIS. At Monk level 17, the damage increases to 4d8+WIS.