Blacklight Phoenix

Flyby. The blacklight phoenix doesn't provoke an opportunity attack when it flies out of an enemy's reach.

Grounded Lightning. The first time on a turn that the blacklight phoenix touches the ground, it takes 11 (2d10) force damage.

Illumination. The blacklight phoenix sheds bright ultraviolet light in a 15-foot radius and dim ultraviolet light for an additional 15 feet.

Lightning Form. The blacklight phoenix can move through a space as narrow as one inch wide without squeezing. A creature that touches the phoenix or hits it with a melee attack while within 5 feet of it takes 9 (2d8) lightning damage. In addition, the blacklight phoenix can enter a hostile creature's space and stop there. The first time it enters a creature's space on a turn, that creature takes 9 (2d8) lightning damage.

Crackling Death. When the blacklight phoenix dies, it explodes. Each creature within 30 feet of it must make a DC 18 Dexterity saving throw, taking 36 (8d8) lightning damage on a failed save, or half as much damage on a successful one. The explosion destroys the phoenix but leaves behind a Tiny, warm egg with a mizzium shell. This egg will fade into the Shadowfell if it is not hatched within 1d4 hours.

The egg contains the embryo of a new blacklight phoenix. It hatches when it is in the area of a lightning spell cast by a shadow magic sorcerer, or if a creature touches the egg and expends spell slots whose combined levels equal 13 or more. When it hatches the egg releases a new larval blacklight phoenix which immediately merges with the nearest shadow magic sorcerer to begin it's lifecycle again.

Blacklight Touch. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 27 (6d8) lightning damage, and black lightning jumps from the target to one creature of the phoenix's choice that it can see within 30 feet of the target. That second creature must succeed on a DC 18 Dexterity saving throw or take 27 (6d8) lightning damage.