Magic Resistance. The Necrophillim has advantage on saving throws against spells and other magical effects.   Necrotic infusion The Necrophillims weapon attacks are magical. When the Necrophillim hits with any weapon, the weapon deals an extra 2d8 necrotic damage (included in the attack)   Undead Fortitude If damage reduces the NEcrophillim to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage was from a critical hit. On a succes the Necrophillim drops to 1 hit point instead   Wing Assisted Jump. The Necrophillims long jump is 30 feet and it's high jump is 20 feet, with or without a running start. The Necrophillim can take this extra movement as part of a bonus action.