This question is about 20th Anniversary edition if it helps.

Whether from losing it in battle, or a metis born with one arm - I was hoping to ask if there’s anything explicit anywhere on how this effects them stats wise?

Whether there’s something written on it lowers an overall stat but rolls are normal, or if certain rolls are at a minus (overall or form dependent wise)?

If not does anyone have any playtested experience about how they homeruled this? For a PC or an NPC.