Jeffery is a giant, gun shooting robot that spawns in the village dimension at night. It is the strongest of the robots.
Defense: around 16
Punches that cause severe knockback. Gun that causes burning.
How to kill
Just take out your ultimate sword or better (you do not have to kill him for big Bertha Unless you want a bigger challenge then the robo-warrior.) Ultimate bow will also do nicely since he knocks you back so far
Redstone, iron, red ant robot kit. Maybe the spider robot kit. Alot of freakin ray guns for big bertha.