Runic Guardian

The Guardian Rune is the only way to effectively shield oneself from the creatures of the Blight. It was created by an unknown academic as a means to ensure the security of the living. You have undergone a ritual that allows you to carve this rune.

Spending 10 minutes, you can mark a surface with the rune, emitting a vibrant purple aura of ultraviolet light and magic. This repels the Blight and harms its creatures, keeping them at bay. The protective aura has a radius of 60ft and lasts indefinitely. 

Once cast, the rune retains its protective ability until the surface on which it is marked is destroyed. Due to the powerful and protective abilities, the ritual requires a great amount of energy from the user to sustain it and as such can only be cast once per long rest.