The only world he had travelled to was Naruto world.
He has a system that can enchant items with or without external materials.
The properties depend on rarity, significance (like cosplay items may have properties related to cosplay character), and material used to enchant (like enchanting the Konoha headband with naruto's blood gave the wearer unlimited chakra)
The good properties are rare and random. So no infinite magic spamming.
The enchantment will require magic from the MC. So not to have infinite weapons.