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/Thermal ------------ Kinetic
Rogue Drones -- All Resis (pri. Expl. kin) ---- EM
Mercenary ----- All Resis (pri. EM, Therm) -- Thermal
The Seven ----- All Resis Kinetic/Thermal.

Burrow / Drone Collection (easiest)
Hideaway / Drone Cluster 3. (Faction) Refuge / Drone Assembly
Den / Drone Gathering
Yard / Drone Surveillance
Rally Point / Drone Menagerie
Port / Drone Herd
Hub / drone squad
haven / drone patrol
sanctum / drone horde

https://imgur.com/a/unnuE0T