Damages types used by different rats:

Enemies ------- Hardener to use ------ Damage type to use

Blood Raider --- EM/Thermal --------------- EM
Guristas ------- Kinetic/Thermal ------------ Kinetic
Sanshas ------- EM/Thermal --------------- EM
Serpentis ------ Thermal/Kinetic ------------ Kinetic
Angel. --------- All Resis (pri. Expl. ,Kin.) --- Explosive
Mordus -------- Kinetic/Thermy thermal ------------ Kinetic
Rogue Drones -- All Resis (pri. Expl. kin) ---- EM
Mercenary ----- All Resis (pri. EM, Therm) -- Thermal
Minmatar. ------ All Resis ----------------- Thermal (sec. Explosive)
Gallente -------- Kenetic/Thermal (sec.. E)---Thermal

Damage To Resist
-Angel Cartel - 7% EM, 62% Exp, 22% Kin, 9% Therm
-Blood Raiders - 50% EM, 0% Exp, 2% Kin, 48% Therm
-Guristas - 2% EM, 1% Exp 79% Kin, 18% Therm
-Mordu's Legion - 0% EM, 0%, Exp, 70% Kin, 30% Therm
-Sansha - 53% EM, 0% Exp, 0%, Kin, 47% Therm
-Serpentis - 0% EM, 0% Exp, 45% Kin, 55% Therm
-Amarr - 47% EM, 4% Exp, 7% Kin, 42% Therm
-Caldari - 1% EM, 0% Exp, 51% Kin, 48% Therm
-Gallente - 1% EM, 0% Exp, 60% Kin, 39% Therm
-Minmatar - 12% EM, 50% Exp, 31% Kin, 7% Therm
-Mercenaries - All (Therm & Kin are heaviest in lvl 4's)
-Drones - All

There is no cake.

Magnetometric Jammer (Aqua icon) - effective against Gallente
Ladar Jammer (Red Icon) - effective against Minmatar
Radar Jammer (Gold Icon) - effective against Amarr
Gravimetric Jammer (Blue Icon) - effective against Caldari