Consume All Life

Consume creates a sphere of magical darkness around the caster 75 foot radius. Any creature with Truesight may see within magical darkness. Creatures in magical darkness (with exception of caster) suffer disadvantage of all throws requiring sight.

As a reaction to being attacked, or as an action on their turn, the caster can cast this spell sacrificing a magical item that is rare or better (caster may also use 1lb of Everore).  The darkness emanates from their being trapping everything inside with a Wall of Force that has 15d20 hit points.  The caster also rolls 5d4 producing that number of  Shadow Demons that emerge from the darkness. If cast as a 5th level spell the wall has 25d20 hit points and the caster rolls 10d4 for the numbers of shadow demons.

The caster, for as long as he is concentrating may keep the Shadow Demons from attacking friendly targets.  Upon suffering any damage the caster must make a WIS or CON save DC 18. On fail their concentration is broken but the spell continues for its three round duration and the shadow demons attack at will not differentiating between friend and foe.  On the death of a shadow demon it explodes for 4d6 shadow damage to anyone within 15 feet.  After three rounds the sphere of darkness falls and the shadow demons return to their realm.

If concentration is maintained for 3 rounds the caster suffers a level of exhaustion. Using spell has a 25% chance to shift casters alignment toward Chaotic Evil.