Devil's Sight. Magical darkness doesn't impede Nyssa's darkvision.
Magic Resistance. Nyssa has advantage on saving throws against spells and other magical effects.
Spellcasting. Nyssa casts one of the following spells, using Intelligence as the spellcasting ability (spell save DC 20):
At will: disguise self, mage hand, minor illusion
2/day each: charm person, dispel magic, greater invisibility, wall of force
Multiattack. Nyssa makes three Bite or Lightning Strike attacks.
Bite. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit:13 (2d10 + 2) piercing damage plus 14 (4d6) lightning damage.
Lightning Strike. Ranged Spell Attack: +12 to hit, range 120 ft., one target. Hit:36 (8d8) lightning damage.
Teleport. Nyssa teleports, along with any equipment it is wearing or carrying, up to 30 feet to an unoccupied space that it can see.