Eternity Circle
From Tardis Wiki, the free Doctor Who reference
The Eternity Circle was a group of five blue Daleks created by the Dalek Emperor. They were given the task of creating temporal weapons to use against the Time Lords during the Last Great Time War. They created the Temporal Cannon on Moldox for that aim. They also created the Predator Dalek, in a plan to create a weapon using the War Doctor. They were presumably destroyed by Borusa when the Doctor told him to destroy all trace of the Daleks in the Tantalus Spiral. (PROSE: Engines of War)
