Contagion Ghoul

Ghoul Illness: Any creature that is bitten by this ghoul must succeed on a DC 12 Constitution saving throw or contract a Ghoul Illness. This disease will cause 2 necrotic damage after the first rest, 4 on the second, 6 on the third, etc. When the creature eventually dies, they will rise as a ghoul themselves. This disease can be cured as any other disease provided the creature is still alive.

Variant Illness: For a more interactive disease, have the creature make a DC 12 Constitution saving throw after each rest. On a failure the amount of damage taken at the end of the rest increases by 2. On a success, the amount of damage taken stays the same.

Diseased Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., one creature. Hit: 9 (2d6 + 2) piercing damage. The target must succeed on a DC 12 Constitution saving throw or contact Ghoul Illness, detailed above.

Claws. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (2d4 + 2) slashing damage. If the target is a creature other than an elf or undead, it must succeed on a DC 10 Constitution saving throw or be paralyzed for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.