I like Pugs

Damage Types to Tank:
Angel Cartel (Gist, Arch, Domination): Exp. primary, Kin. secondary, Therm. + EM minor
Blood Raiders (Corpus, Elder, Dark): EM + Therm
Guristas (Pith, Dire, Dread): Kin. primary, Therm. secondary
Serpentis (Core, Guardian, Shadow): Therm. + Kin.
Drones (Alvus, Strain, Sentient): Exp. primary, Kin. + Therm. seconday, EM minor
Sansha (Centrus, Loyal, True): EM + Therm.

Damage Types to Deal:
Angel Cartel: Explosive
Blood Raiders: EM/Thermal
Guristas: Kinetic
Serpentis: Thermal/Kinetic
Drones: You're fucked anyway throw everything you have at them
Sansha: EM/Thermal