Adult Arclight Phoenix

Flyby. The adult arclight 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 adult arclight phoenix touches the ground, it takes 11 (2d10) force damage.

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

Lightning Form. The adult arclight phoenix can move through a space as narrow as 1 inch wide without squeezing. A creature that touches the adult phoenix or hits it with a melee attack while within 5 feet of it takes 9 (2d8) lightning damage. In addition, the adult arclight 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 adult arclight 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 adult phoenix but leaves behind a tiny, warm egg with a mizzium shell.

The egg may hatch before 1d6 days have passed if it's in the area of a spell that deals lightning damage, 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 adult arclight phoenix that appears in the egg’s space.

Arclight Touch. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 27 (6d8) lightning damage, and lightning jumps from the target to one creature of the adult 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.