I've discovered the culprit?
Holy Sword Tournament Arc
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Vanessa, Arthur's twin, was a plausible suspect in his potential murder, but given that the Cross Kingdom followed Male Primogeniture, it didn't make sense for her to do so.
Jericho, being the next in line for the throne, was a possible culprit, but everyone considered him a decent person incapable of such a crime.
It wasn't wise for him, the most likely suspect in such a scenario to commit such a crime.
Bluestella, Jericho's mother, could also be considered, given her desire for her son to succeed the king, especially since Arthur didn't yet have a son.
As we discussed the possibilities, Serena's melodic voice interrupted our thoughts, "What's our next plan of action?" I looked up, appreciating her keenly inquisitive nature.
"My first order of business is to interrogate Nerbas," I responded. Isadora, nodding in agreement, affirmed my decision.
I got up from my bed to leave.
Serena stopped me, beckoning me to sit down again.