Nystul's Blackmote

This spell summons a microscopic mote of energy from the Negative Material Plane to the caster's hand. The caster must immediately roll a saving throw vs. death magic at a +2 bonus to control the mote. If successful, the mote lies dormant in the wizard's hand for one round, building up power. The caster can do nothing else during this period, full concentration on the mote is required. If the caster's concentration is broken during this time, the blackmote is dispelled. At the end of the round, the spell is at full power and the mote can be hurled at a creature within the range of the spell.

The blackmote automatically strikes, exploding in a burst of darkness and cold, inflicting 2d6 damage plus one point of damage per level of the caster (to a maximum of 2d6+10). Undead and creatures from the Negative Material Plane or lower Outer Planes are unaffected.

A caster who fails the initial saving throw loses control of the mote. It immediately explodes in the caster's hand, inflicting one point of damage and paralyzing the wizard for 1d4 rounds.

The material component is a sliver of bone taken from an undead skeleton.