i found the scroll "imprison" too. in the cemetary, in one of the crypts is a "random" box. sometimes you get protection from the elements.. and it does depend on your level.
spoil'
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and the mage stronghold: that imprison rune..even though it is tailored to that guy..is an imprison spell weilded by your char.
When logic and proportion,
Have fallen sloppy dead,
And the White Knight is talking backwards,
And the Red Queen's "off with her head!"
Remember what the doormouse said.