Originally, Elona was intended to include an artifact fusion system that was never fully implemented. Inheritable effects were marked by a special symbol next to the effects. Elona+ adds a different form of artifact fusion, which will take a piece of equipment and add attributes to it based on the item chart below. To be able to fuse artifacts, you first need to complete the quest offered by Thalia the star viewer, which is detailed here. Once it is completed, you can talk to Irma the indomitable smith in the map that appears at the end of the quest, and have her use her item fusion abilities for you. She can upgrade equipment if she is presented with a piece of equipment that is either an artifact or unique, a scroll of gain attribute, plus one of the fusion component items listed below.