I made the following changes.
Norse surface monsters give an improvement commensurate with their value.
Rune Stone abilities are no longer automatically lost on an hourglass save. They are degraded to the lower of either the current duration of the ability or the saved duration of the ability. Also, if you do not currently have the ability or if you didn't have the ability when you turned over your hourglass, then you will lose the ability.
Thanks,
Beowulf