Rot is the biggest concern for anything!
It looks rather dry though. If it is wet and spreading, then it's on its way down. There are a few things you can try though, although there's no guaruntee that any attempt will cure your plant.
So, is it spreading or is it just dark and dry?
A few helpful things that I recommend is, pouring hydrogen peroxide on the rot area. Repeat this every 3 days or so. Keep a close eye on the dark spot to make sure it's not spreading.
Stop
misting the leaves as extra moisture on the wound is always a ticket to rot or fungal problems.
Your two other phals look very healthy while the one in the center looks dehydrated as someone above mentioned.
You could repot in moss, but bark is also fine. You just have to soak the whole pot in water and leave it like that for ten minutes or so (I soak mine half an hour or longer when I forget lol ).
Moss maintains moisture better, but if you are not careful, root rot is all to common to phals or any orchids potted in moss.
I wish you the best with your phal.
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