Work in progress:
This is a summary of the Blight Runes characters in Villagers & Heroes can acquire.
The runes are split into 4 "factions": Ash, Blood, Death, and Shade. And each faction has a "guard" rune (on a piece of armor/gear), and a "bane" rune (on a weapon). Additionally, there is a "Superior" version of the rune available on the "Mythic" version of the blight gear. The runes are all passive runes.