The Grandmaster Robot.
This is the Ultimate Boss of all Robots, The Grandmaster, but this page will refer to him as GrandBot.
Currently, No Player has beaten the GrandBot, due to his wild attack patterns and crazy new mechanic involved. He does drop the BEST melee weapon in the game.
Required Gear
Full Dragon Amrour 
Golden Rapier (poison) 
Ballista 
Ice/Ancient Arrows 
Master ring 