He enchants the slotted items from the NPCs Ophaine and Sharick.
There's a 1% chance your item can break when you try to enchant it.
Possible Enchants:
STR+1 (4700) , 
INT+1 (4710) , 
DEX+1 (4720) , 
AGI+1 (4730) , 
VIT+1 (4740) , 
LUK+1 (4750) , 
MDEF+2 (4786) , 
DEF+3 (4791) .