This topic is a hard one, I don't know which I should've put it under?? (Yes, I know this isn't a mutation)
The idea of this was for lionesses and males who are over 10 years (Or in rare cases cubs / adols) possibly have lowered stats, are rarely able to hunt, and would maybe have an expression of pain or a lineart of them laying down.

What is Rheumatoid Arthritis you ask? For now let's call it RA because i'm not spelling that shit out five times. RA is inflamed joint linings. It affects many joints as ones in hands, legs, feet, etc. As someone who suffers from it (Juvi RA) I can assure you it's painful as hell. RA is normally caused by old age. Another reason to why this should be added is that it can affect all animals considering it only degrades joint lining.

I love any feedback! Also, please don't feel bad to share why you don't support this idea!!

(This would be a random chance. Not every lion would get it.)


Year 10 message:
Your lioness is experiencing pain! She is unable to walk properly.

Year 10(month 2) message:
Since your lioness has last experienced pain it has gotten worse! Now she rarely stands, much less hunts!

((Yeah it needs some work^^ ))

Also as an idea by other people lionesses and sub males could have high fail risk at hunting / patrolling.