Mnemosyne is one of many memory runes, along with a rune called Eidetic Memory. It is a permanent memory rune that grants the Shadowhunters great memory in general.
Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.