Polarities - berkus/warframe GitHub Wiki
Madurai - V (Damage, Powers) - Commonly dropped by Grineer
Vazarin - D (Defensive, Health, Armor) - Dropped by all factions
Naramon - Dash/Bar (Misc.) - Commonly dropped by Corpus
Zenurik - Scratch (Warframe Augments and Channeling Mods)
Penjaga - Y (Companion Abilities) - Dropped by all factions
Unairu - R - Melee Stance Mods