I have been doing a bit of sifting through the grimiore and why isn't there much on ya boi Taniks (Tan(x)). The only notable thing is him stealing the archon priest and killing andal brask. They dont talk about anything else really and that goes for a lot of the other fallen ultras :/. GIVE US LORE ON TANIKS!!!!!!!!
I think he killed Cayde's hunter buddy. But idk if that is true.