I have a level 6 life rune somewhere but I don't remember which monster it is currently used on.
Do I really have to check through every monster to see manually?
I think it would be a good idea to have a searchable filtered list in the rune building where you can see which monsters have certain types of runes assigned.
For example, want to know which monsters have team speeds? Then a list of all your monsters come up in the search results, allowing you quick access to change the runes...