Demonic Shadows. The demon darkens the area around its body in a 10-foot radius. Nonmagical light can’t illuminate this area of darkness

Devour Soul. The demon can eat the soul of a creature it has killed within the last hour, provided that creature is neither a construct nor an undead. The devouring requires the demon to be within 5 feet of the corpse for at least 10 minutes, after which it gains a number of Hit Dice (d8s) equal to half the creature’s number of Hit Dice. Roll those dice, and increase the demons hit points by the numbers rolled. For every 4 Hit Dice the demon gains in this way, its attacks deal an extra 3 (1d6) damage on a hit. The demon retains these benefits for 6 days. A creature devoured by the demon can be restored to life only by a wish spell.

Magic Resistance. The demon has advantage on saving throws against spells and other magical effects.

Magic Weapons. The demons weapon attacks are magical.