Abhorrent Split

When you use Soul Investiture, or as bonus action without using it, you can split your Forbidden Artifact into multiple writhing branches. This lasts until you end the effect as an action (or end the Soul Investiture). The weapon's damage dice convert to smaller increments based on the table below:

It can attack other creatures even while grappling or restraining a creature with the Grasping Form artifact property, but loses one damage die (starting with its smallest) for each creature it is grappling or restraining.