Timetravel_01
Based on a game aight.
This games lore is very deep and complex so if you don't understand it that's fine I will use this area as a space to explain the lore as the book goes on.
Excalibur - The first of them built to fight the sentients when seen in battle it astonished the Orokin which drove them to build more to eventually defeat the sentients
Volt - A master of electricity capable of causing an electric storm from the faintest trace of electric harnessing the power stored in his warframe and those around him to shock his enemies.
The Stalker - A tenno gone rogue bent on killing all tenno for what they did after the Old War to the Orokin. Usually using a tenno's recent assassination victim as a reason to strike.
Grineer - An oppressive human empire built from Earth out towards the origin system with little regard for those who aren't grineer and will do anything necessary to gain power.
Earth - Do I really need to explain this?