Human Experiments 2.0
Since it was not yet possible to insert SoulStar Fragments into his Summons without killing them, Michael decided to try something else.
He had various Artifacts stored in his War Rune and the warehouse. They collected dust and were better off being used instead.
Michael began a few experiments using Insert on Artifacts to merge them with Monsters and Summons. The first Artifacts he retrieved for that job were Accessory Artifacts. He inserted Tierless Earring Artifacts into the earlobes of his Tier-1 Summons and some Tier-1 Bilrox to observe their bodies' reaction to the integration of Artifacts.
The external enhancement from the Tierless Earring Artifacts was low, but that was fine. The Earring Artifacts focused on amplifying the hearing sense instead.