*** NPC damage types ***
Guristas - Kinetic Thermal
Serpentis - Kinetic Thermal
EoM - Kinetic Thermal
Blood Raiders - EM Thermal
Sansha's Nation - EM Thermal
Angel Cartel - Kinetic Explosive
Minmatar Republic - Kinetic, Explosive Thermal
Mercenary - EM, Kinetic, Explosive Thermal
Rogue Drones - EM, Kinetic, Explosive Thermal

*** Best damage types to NPC ***
Guristas - Kinetic
Serpentis - Thermal
EoM - Kinetic
Blood Raiders - EM Thermal
Sansha's Nation - EM Thermal
Angel Cartel - Explosive
Minmatar Republic - Exp

Harden
Angel: Expl + Invul
Serp: Kin + Invul (or Kin + Therm)
Guristas: Kin + Invul ( or 2xKin)
Sansha/BR: 2xEM
Caldari State: Kin + Therm
Mercs: Therm + Invul