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. --------- Explosive/Kinetic --------------- Explosive
Mordus -------- Kinetic/Thermal ------------ Kinetic
Rogue Drones -- All Resist --------------- EM
Mercenary ----- All Resist --------------- Thermal
Minmatar. ------ All Resist ---------------- Thermal, Explosive
Gallente. ------- Kinetic/Thermal (sec. EM) -- Thermal
Amarr --------- EM/Thermal. -------------- Thermal
Caldari -------- Kinetic/Thermal ------------ Kinetic

https://eve-survival.org/wikka.php?wakka=missionreports
Damage Sources:
EM: Acolyte/Infiltrator/Praetor - Mjolnir — EMP/Proton
THER: Hobgoblin/Hammehead/Ogre — Inferno — Plasma
KIN: Hornet/Vespa/Wasp — Scourge — Titanium/Lead
EXP: Warrior/Valkyrie/Berserker — Nova — Fusion
Uranium: THER/KIN/EXP


Combat Site Difficulty:
Burrow < Hideaway < Refuge < Rally Point < Den < Yard < Port < Hub < Haven < Sanctum

Combat Site Difficulty:
Hidden < Forsaken < Forlorn