I suspect that it is due to Idalia's rather unique nature that she would survive Jermayan's death. I am assuming that we're talking about Jermayan's death in Tiercel and Harrier's time specifically, as I can't offhand remember a time in the Obsidian Books after Jermayan and Idalia had made the True Bond that Jermayan was in danger of dying.
As with everything else, the time one Bondmate survives the other can vary, though it's never very long: in the (cut) opening section of CROWN OF VENGEANCE, Nataranweiya survives Serenthon's death by several days, though she suffers debilitating effects.
Rune will certainly return.
Clearly, Rune and Vielle will have to reach some accommodation eventually, but in BLADE, the matter isn't going to arise...
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As with everything else, the time one Bondmate survives the other can vary, though it's never very long: in the (cut) opening section of CROWN OF VENGEANCE, Nataranweiya survives Serenthon's death by several days, though she suffers debilitating effects.
Rune will certainly return.
Clearly, Rune and Vielle will have to reach some accommodation eventually, but in BLADE, the matter isn't going to arise...