I'm thinking something that punishes the player for running away from a blight which they've engaged.
After striking a blight, a bind is created and if that blight despawns without being killed (as a result of a player running far away) the player takes a damage equal to a configurable percentage of of their HP.

That's a very interesting idea, I'll see what I can do.

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I think it should just be you get a warning spooky sound and it spawns an ender particle at your location, then after a delay the blight just comes in and tried to telefrag you and continue chasing you. so the blight essentially becomes like a grim reaper "pursue and destroy" guy that once you see him and try to fight him he'll come after you.

Instead it'd be on a time delay after the blight losses lock on you. but there could also be potential here for ways to avoid said blights with some other mechanics perhaps.