After starting the upgrade for the system, Lin Fan didn't do anything else with the two remaining fragments.
There was the option of giving one of the fragments to the Dungeon Master System and seeing if it would upgrade as well, but he didn't take the risk in the end.
Compared to upgrading the Dungeon Master System, Rokuko and Xiao Bai were more important to him.
If he really was to upgrade it, he would go looking for Weiss first and confirming if he could upgrade it with these fragments. At the same time, he would also confirm whether it would have any side effects on them since the origin of these fragments was demonic.
Before Lin Fan made sure of this, he wasn't willing to risk either Rokuko or Xiao Bai with these fragments.
He would rather risk himself since he was certain that his system would be able to take it.
