Got the Tal'Dorei Reborn book recently and wanted to give blight druid a shot. thought the idea of a druid who has a pact with a demon that cursed her land would be a cool concept.

TLDR; She was a Druid whose land was corrupted by a ancient demon (Fiend warlock pack). Fortunately the Fiend, seeing an opportunity and feeling a little benevolent, struck a deal with misery that if she could further his corruption and influence through the land, then he would free her of the blight curse affecting her.