Boss Bot
Big Bot, also known as Giant Bot or Boss Bot, is a large Bot which is composed of and splits into many blue Bots when hurt. Like the Bots it comprises of, the Big Bot hops around its territory in the Great Palace.
As the Bots the Big Bot splits into are just your average Bots, they are easily taken care of. However, the Big Bot awards no experience, and also takes no beam damage.
Trivia
This enemy's Japanese name is Botomasuta, roughly translating into Bot Master.