Homebrew
Magic Resistance. The demon has advantage on saving throws against spells and other magical effects. Multiattack. The demon makes two attacks: either Claw or Slam.
Claw. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 2d6 + 4 slashing damage plus 1d6 necrotic damage. Slam. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 2d10 + 4 bludgeoning damage. Bloodsucking Sting (Recharge 6). Ranged Weapon Attack: +5 to hit, range 30 ft., one target. Hit: 1d6 + 2 piercing damage, plus 1d10 necrotic damage. The demon regains HP equal to the necrotic damage dealt.