NPC that is in charge of adding and removing the seed sphere of your items is located in ⛳ Elveland (50, 242), also NPC mount a completed seed sphere to a socket item. Attack weapons :Fire, Ice, Lightening seed sphere only, Defense weapons => [Water, Wind and Earth seed sphere only.
Well, here are some suggestions for you if you`re interested to make a ❓ [ socket item ] . First, go to 👤 Seed Researcher.