Burial

You call upon the twisted corruption entwined with your damned soul to split the very ground with your darkness. A large crack opens up in the ground in a 5 foot wide by 30 feet long area. All creatures within this area must make a dexterity saving throw with a DC of 18. Upon success, the affected creatures escape the danger. Upon failure, the ground swallows the targets and begins to crush them with necrotic energy, dealing 10d6 necrotic damage and restraining the targets for 10 minutes or until you lose concentration or use a bonus action to release the spell. A restrained creature may use attempt to break free of the spell at the end of its turn by making a strength saving throw with a DC of 18. Each affected creature that starts its turn trapped within the crevice takes an additional 5d6 necrotic damage each turn.