Stacking penalties

f(1) = 1
f(2) = 0.8708860
f(3) = 0.5705831
f(4) = 0.2829552


Damage type to protect against:

Angel - Exp / Kin / Therm / EM
Blood - EM / Therm
EOM - Kin / Therm
Guristas - Kin / Therm
Mercenary - Therm / Kin / Exp / EM
Mordus - Kin / Therm
Rogue Drones - Exp / Kin / Therm / EM
Sansha - EM / Therm
Serpentis - Therm / Kin

Main Damage type to use;

Angel - Exp / Kin
Blood - EM / Therm
EOM - Kin
Guristas - Kin / Therm
Mercenary - Kin / Therm
Mordus - Therm / Kin
Rogue Drones - EM
Sansha - EM / Therm
Serpentis - Kin / Therm