As an action, you pierce a creature that you can touch or see within 18 meters to the core with shadow for the duration. At the start of each of its turns while affected by this spell, the creature must make a Fortitude saving throw.
On a failed save, it takes 2d8 necrotic damage and rolls a d6.
On a roll of 1–2, the shadow spreads to the legs so the target’s speed is reduced to 0 until the start of its next turn.
On a roll of 3–4, the shadow spreads to the arms so the target has disadvantage on attack rolls until the start of its next turn.
On a roll of 5–6, the shadow spreads to the head so the target is blinded until the start of its next turn.
On a successful save, it takes half as much damage and the effect ends.
You can increase the damage by 3d8 for each additional mana or psi expended.