Stacking penalty mod for Nth module or rig =
0.5 ^ [ ((N-1) / 2.22292081)^2 ]
1 : 1.0000000000
2 : 0.8691199806
3 : 0.5705831430
4 : 0.2829551534
5 : 0.1059926494
note: modules with highest bonuses are calculated first.
Damage Types Dealt by NPCs
Amarr Navy - EM / Thermal
Angel Cartel - All Types
Blood Raider - Thermal / EM
Caldari - Kinetic / Thermal
Gallente - Kinetic / Thermal
Guristas - Kinetic / Thermal
Minmatar Fleet - Thermal / Explosive
Mercenaries - Kinetic / Thermal / Explosive
Mordu's Legion - EM / Kinetic / Thermal
Rogue Drones - All Damage Types
Sansha's Nation - EM / Thermal
Serpentis - Kinetic / Thermal

Damage Types to Fire on Enemies:
Angel - Explosive
Blood - Thermal
Drones - EM
Gurista - Kinetic
Mercenaries - Thermal
Mordus - Thermal & Kinetic
Sansha - EM

Targeting systems
Minmatar - Ladar
Caldari - Gravimetric
Gallente - Magnetometric
Amarr - Radar

Security Status
-2.0 cannot enter 1.0
-2.5 cannot enter 0.9