NPC THEY DEAL I DEAL
ANGEL Kin/Exp (Exp)
AMARR EM/Ther (Ther)
BLOOD EM/Ther (EM)
CALDARI Kin/Ther (Ther/Kin)
GALLENTE Kin/Ther (Ther)
GURISTAS Kin/Ther (Kin)
KHANID EM/Ther (Ther)
MINMATAR Ther/Exp (Ther/Exp)
MERCENARY EM/Ther/Kin (Ther)
MORDUS Kin/Ther (Kin)
SANSHA EM/Ther (EM)
SERPENTIS Kin/Ther (Ther)
DRONES All types (EM)

EM: Acolyte/Infiltrator/Praetor
THER: Hobgoblin/Hammehead/Ogre
KIN: Hornet/Vespa/Wasp
EXP: Warrior/Valkrie/Beserker

Stacking Penalities
1st mod: 100,000% effectiveness
2nd mod: 86,9119842% effectiveness
3rd mod: 57,1037996% effectiveness
4th mod: 28,2469117% effectiveness

https://forums.eveonline.com/default.aspx?g=posts&t=24359