Spoilers for the newest chapter of inky mystery.
My favorite thing to do when a character gets injured (especially when its a favorite) is to imagine one way it could end horribly. (That isnt death)
So. What if the venom has already worsened throughout their time waiting, unbeknownst to the nurse? (which could be part of the reason why Bendy ended up fainting.)
What if the venom has gotten so bad, to the point they fear it may spread throughout the rest of his body. How to stop that? Amputation.
Now without his arm, Bendy would have to build himself a mechanical replacement, like he did with Mickey's leg. (Yes, Bendy is a demon, so he should be able to just regenerate that arm at a later date, when he learns how to.)
Except Bendy's new arm could be woven with demon magic, with the help of both Murklin and maybe Hat. (And himself)
Think it would be a cool little outcome. Might draw that idea later.