Way of the Wicked
Listed below are the standard Traits that Cardinal Thorn can provide. If there’s nothing here that suits your needs, I’m willing to offer something else provided you can give a fair argument how a high level evil cleric would have the means to give you such tutelage (to be fair, he does have considerable resources at his disposal).
“Asmodeus is with you.” Adrastus Thorn indoctrinates you into the deeper mysteries of worshiping the Prince of Hell. Whenever you channel energy, you gain a +1 trait bonus to the save DC of your channeled energy.
“Deception is a tool. Master it.” Adrastus Thorn teaches you the subtle arts of deception and how to sense when they are being used against you. You gain a +1 trait bonus to Bluff and Sense Motive.
“Discover what is real and what is illusion.” Adrastus has taught you to see through deceptions and to never lie to yourself. You gain a +2 trait bonus on saving throws against illusions.
“Fear nothing save our dread lord.” Adrastus Thorn has shown you fear and taught you to master it within yourself. You gain a +2 trait bonus on saving throws against fear effects.
“Focus strengthens your will.” Adrastus Thorn drills you on ways to avoid magic that seek to take control of your mind and divert you from your mission. You gain a +2 trait bonus on saving throws against charm and compulsion effects.
“Let us perfect your favorite spell” Adrastus Thorn drills you again and again in the use of one particular spell. Pick one spell. This spell’s effects manifest at +1 caster level.
“Quiet as death” The Cardinal trained in the arts of being silent and stealthy. You gain a +2 trait bonus to Stealth checks.
“Strike first, strike ruthlessly and thus be victorious” Cardinal Thorn has taught you never to shirk or hesitate in a combat. You gain a +2 trait bonus on Initiative checks.
“Wear your armor like a second skin.” You have drilled extensively in wearing armor in combat. When you wear armor of any sort, reduce that suit’s armor check penalty by 1 to a minimum check penalty of 0.
“You shall be my angel slayer.” Adrastus thorn spends exhausting amounts of time teaching you about good celestials, their strengths and weaknesses. You gain a +2 trait bonus on Knowledge (planes) checks about good-aligned celestials and receive a +1 trait bonus to any damage roll you make against them.