Banker

With this Mod, you add a new Entity into your Minecraft Experience. The Banker will help you as long as you don’t hurt him. He does the following things: 

– Attacks any Monster in a vicinity. It can be Zombies, Skeletons or Witches. He will take care of it.

– Trade with you. If you right-click on him with an Goldbar in your inventory. He will take the Gold and as an exchange, give you a Experience Bottle.

If you manage to find or summon him. You will have a sort of a bodyguard. He will protect you and your house.