Many equipment Are basically obtained unsloted.
many have their slotted versions too so here these 2 NPC Seiyablem and Leablem socket enchant your equipment at the charge of a nominal fee of course.
this information is for those who are very knew to Ro and don't know about its mechanics.
and for old players after episode 12 now there are 2 npc first it was only Seiyablem.
There are tons of guides which tell which equipment requires what but i found this to be the best