You send a letter in which you praise his cooperative stance and give him a place of meeting where the boy will be exchanged for the jewel.
889 AD, Late Summer
Tails
The healers are now sure - your daughter Aife did not get pregnant during her tryst(s?) with Radius.
Few days later the men sent to escort Radius to the border return with a small chest, inside of which was the big black jewel as promised by the Governor.
889 AD, Few hours later
You look as the old, bearded man paces around the table, appraising and touching and turning the jewel around, humming thoughtfully.
"You're checking it out for a long time now." The advisor glances at you.
"Because I can't shake the feeling that I saw this thing somewhere already." He stops and pats his beard. "During Houlandin II's reign, maybe?"
"But that was over fifty years ago." You blink. "How old are you aga-"
"Ah yes! I know, my Queen, it's the head of the Murder Time!"
The advisor then briefs you on the short history of the weapon before it was lost to the Lametanians."Is it still useable?" You ask the Advisor who turns the jewel around few times.
"Well it's surely a little abused, there's small chippings here and there... we could always put it on top of a golden scepter and make it a Crown Jewel of Luathbas, to go along with the knife and the necklace, my Queen." He hums. "We could ask the dwarves to make a magical item out of it, if the magic's still innit."
A) "The dwarves are costly to employ so let's make this obsidian chunk into a scepter!"
B) "Get me the dwarves at once because we clearly need another artifact weapon!"
C) "Hmm, we will stuff it into the Treasury for a while and sell it if needed."