Idea: Make some sacrifices require that you kill certain amount of a mob

[James103]

For example, you may not be asked to give an item, but instead you may be asked to kill a few zombies or something like that (e.g. "Kill 5 Zombies" or "Kill 3 Skeletons"). Eventually, you could be asked to "Kill the Ender Dragon" (only given when at max difficulty) or "Kill 3 Shulkers".