Mattock submitted this

I object to everyone saying that Horned Reapers are more trouble than they're worth. Horned Reapers are the most powerful creature in the game, and there is a way to keep them under control. Before summoning it, build a room, probably at least a 5x5, at the end of a small corridor. Block off the corridor with a door (or more if you are paranoid), and lock it. In the room, build a lair, training area, hatchery and treasury (only a few squares big, mind, they're only for one monster). I am not sure whether the Reaper needs to eat or get paid, but better safe than sorry. Now summon your Reaper, and place him immediately in his room. He will build a lair and go to sleep, so set him training. Remember to make sure the door is locked! After a while, he may become angry, so you can do oe of two things, i) Pick up some coins and drop them on him, he will play with them and be happy for a while. ii) combat makes him happy, so find some enemies for him too kill, or even better, drop a prisoner in his room!

Now you have your Reaper contained, away from your other monsters, so he will not start slaughtering them at random. Whenever you want to use him, just pick him up from the Creature Table and drop him into battle. Watch the table constantly. As soon as you see that he is not in combat, pick him up and place him back in his room. He will attack enemies over your own monsters, but don't let him wander around. As long as you keep him training, you should find he will rip a whole hoard of the enemy apart single handedly, and if use strategically, will be well worth those three creatures you sacrificed to get him.

All the sacrifice combos so far - wow, let's see!