Comment author: FiftyTwo 23 December 2012 10:04:02AM 2 points [-]

Someone killed them? The stone doesn't protect against unnatural death, and I imagine they'd be targets for powerful wizards.

Comment author: regncyning 23 December 2012 04:18:52PM 1 point [-]

That was my thought exactly. Any Dark (or Light) Lord rising to power would want to knock off any ancient immortal wizards who still happened to be around first, as they'd be an obvious threat to their plans. Historically immortals probably got wiped at the start of each big Wizarding War.