Note: Smart Robo was disabled during the 7/14/2021 maintenance due to a bug.
Smart Robo is an NPC that can enhance equipment of grade +5 or lower by sacrificing equipment boxes of the same grade (e.g. Pegasus gear can be enhanced using Pegasus Equipment Boxes). The number of boxes required depends on the grade (+) of the gear you wish to enhance.
While you can only start with a grade of +5, results can be as high as +8 (rare) or higher (rarer).
If an enhancement succeeds, the equipment boxes are sacrificed, and the equipment gains a random number of grades.
If an enhancement fails, you lose the equipment boxes, and the equipment loses a number of grades (usually 1 or 2).
This is an easy way to upgrade specific pieces of equipment and is far faster and less random than opening and enchanting equipment boxes.