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Player > Augmentations > Biotech > Pain Modulator
Starfinder Adventure Path #29: The Cradle Infestation (The Threefold Conspiracy 5 of 6) p.51
Your brain has a specialized gland to process pain signals separately from your higher brain functions, allowing you to maintain concentration in stressful situations. You can concentrate on a spell even when you take damage that reduces your Stamina Points (but not your HP). In addition, whenever you end your turn under a pain effect that requires you to attempt a saving throw, you can attempt a new saving throw against the effect; if you succeed, the pain effect ends.