Angels (Minmatar), Serpentis (Gallente), Guristas (Caldari) and Sansha (Amarr)
Type of hardeners to protect against:

Amarr (Khanid) Navy - EM & Thermal
Angel - Kinetic & Explosive (some EM and Thermal)
Blood - EM & Thermal
Caldary navy - Kinetic & Thermal
EoM - Kinetic & Thermal
Gallente - Kinetic & Thermal
Guristas - Kinetic & Thermal
Mercenary - EM & Thermal (& Kin)
Minmatar - All
Mordu - Thermal & Kinetic
Sansha - EM & Thermal
Serpentis - Thermal & Kinetic
Rogue DRONES - Exp & Kinetic

Damage type to use:

Amarr Navy - Thermal
Angel Cartel - Explosive
Blood Raider - EM
Caldari State - Kinetic
EoM - Kinetic (mainly) & Thermal
Gallente Navy - Thermal
Guristas - Kinetic
Mercenary - Thermal
Minmatar Fleet - Thermal/Explosive
Mordu's Legion - Thermal & Kinetic
Pithi Explosiv
Sansha's Nation - EM
Serpentis - Kinetic
Rogue Drones - EM