He knew what he was doing was faulty, so he didn't have much hope for the outcome. In fact, he expected a failure and was willing to bet on it. He just didn't know what kind of failure the outcome would be, which was why he was curious.
He tried to infuse lifespan into the inaccurate black book of law fragments, and it accepted it. It absorbed the lifespan and used it to transform into an incomplete Supreme Metac at the phantom stage.
Next, he tried pushing lifespan into it to solidify it. This went well too. The incomplete Supreme Metac gulped down the lifespan until it was saturated.
"This is another moment of truth," he said as he grabbed the white ring and placed it on the incomplete Supreme Metac.
Then he put some virtual distance between him and the workbench to get a better view of what would happen.
