Deaths Embrace

You create a plethora of skeletal hands, Which pierce out of the ground, The Hands grapple a nearby enemy dragging them into the ground the hands begin the first round doing 1d8 damage with every round where the enemy is still in the skeletal grasp the dice count doubles going from 2d8 to 4d8 and so on. To escape from the spell and enemy will have to roll a dexterity saving throw, The enemy will have to roll and try and beat the characters wisdom modifier, Though the score to beat goes down by 1 every round when the spell is active eventually stopping on 8

When casted at 4th level the dice changes from 1d8 to a 1d10,
When casted at 6th level the dice changes from 1d10 to a 1d12
When casted at 8th level the dice changes from 1d12 to a 1d20