Remember you can use this with my pay what you want rpg, Six-Shooters & Wagons.
AC 4  HD:1 Attacks: Gore (1d6 damage) Move: 15
When making attack rolls the jackalope rolls 2d20 and uses the better of the two results. When attacking a jackalope, the attacker rolls 2d20 and uses the lesser of the two results.
A person that delivers the killing blow on a jackalope my perform a ritual on one of it's feet. Once this ritual is complete the person can gain the following benefit once per day, When making an attack roll or saving throw, the character can roll 2d20 and use the higher of the two results.