The Trial of Grasses

This feat involves the recipients body being subjected to an incredibly painful process.  It involves the consumption of special alchemical ingredients known as "the grasses".  Reportedly only three in ten people survived the trial.  Those that do survive heal quicker, gaining 1 hp per level after every short rest, immunity to disease, resistance to poison and cat like eyes which possess superior darkvision (120").  These cat like eyes are very unnerving and grant proficiency in intimidation but impose a penalty of -2 on all persuasion roles (as people find it hard to trust mutated freaks).  Another side affect of the trial is that the subject becomes sterile.