Elbow Spikes on a Creature's Wing

Believability of a fantasy creature can go so far. Case in point--the title feature. I have first seen it on a Ringwraith's winged mount...

I never understood the appeal. Bats don't have it. Pterosaurs certainly didn't have it. It doesn't add to the wings' appeal--it just makes them look scrawnier.

Without the need for a spike growing from its elbows, a bat's wings look better and cover more surface area needed for flight. So in regards to adaptation, what point would elbow spikes on a creature's wings serve?

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Elbow Spikes on a Creature's Wing

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