Corrupted Titans

Not every titan either fell in battle or lived in solitude. For some, Fate allowed less dignity, and they become corrupted through fear or pride.
The Tomb Wardens of Thosis were overwhelmed by the War. Before, they had watched over a peaceful community of retired contemplatives. The modest necropolis within Thosis housed only a mere handful of Titans, who had sacrificed their lives when the divine power within them was needed for some grand undertaking. Each death was meticulously planned and prepared for. The coming of the Colossi and the becoming of time changed that, and suddenly the Wardens had to deal with hundreds of dead with no mausolea or monument prepared. Worn to exhaustion, the Wardens were unprepared to counter the reckless actions of Zerah and Shem. The curse of undeath that they unleashed survived their own destruction by the Undying King, and Thosis endures, its crumbling foundations, like the flesh of its Wardens, bound past their time by necrotic. energies.
Every war has its casualties and its heroes, but also its villains and its treacheries. There were titans who, faced with the fall of the titan Stars, surrendered themselves to despair. and sought to ally themselves with the power of the Colossi. While most of these were hunted down and destroyed by their kin, a few survived. They gathered Giants to their cause, creating the first faendr The last of these fallen titans survive as living conduit of the Void and objects of worship for the fomorians.
Finally, not all of the empyrean merely deserted Titans. Some were willing to join with the enemy to try to survive. Again, most of these died, but a handful survived, and even a single fallen empyrean constitutes an existential threat to any mortal culture.