The Winged Triskelion is an artifact of immense world bending power that was used in the events of a Celestial Crusade. In antiquity it was believed to have weather powers, however the adventuring party composed of Orem Rivendorn, Randus Duthane, Sir Brenzin the Bold, and Glaa found that it had the capacity to alter the nature of things through the psionic influences of those nearby.
The Winged Triskelion is known to have created a massively destructive angelic force along with a horrific array of undead monstrosities in the farbrights. It also combined the deadly parasite with the flame sword +1.
It was destroyed when Randus and Orem took it apart to make the bomb to end the war with the Void.