High Rejection Threshold

-1 point

Your body strongly rejects tissue transplants, cybernetic
parts, undead limbs, and so on. If a roll is required for this, you
have -3 where failure means rejection or +3 where success
means rejection (as in GURPS Bio-Tech). If no roll is required,
you must still fail a HT roll or the implant won’t “take.”
This quirk is allowed only in settings where PCs can acquire
such modifications.