So, you either got this support bot either from a RO cube or from the shop.
Only junking the damned thing for the arm?
Please, it's not the only thing it's useful for.
Key Points:
It's a support type. Able to use nearly all bits.
It's M sized. You are able to equip S, M, L sized things. In other words, a lot of stuff.
The core is relatively small.
Has all guards.
Has broad radar.
Able to hop.
Has stun regain.
Cons
Somewhat limited capacity to work with?
Long process to gain access to hopping. It's levels 8+.
Now go have fun with your hopping camouflaging burst firing undead Bugsycait. Couple it with the arm and you're a mean Bugsycait, if you wish to sacrifice potential firepower for more defense.
