Name : Elusive Blasphemite (id=435501) [Hidden]
Effects :
#1 (id=1126149) : Apply Aura (6) | Dummy (4)
Base Value: 2 | Scaled Value: 2 | PvP Coefficient: 1.00000 | Target: Self (1)
#2 (id=1126150) : Apply Aura (6) | Increase Speed% (31)
Base Value: 0 | Scaled Value: 0 | PvP Coefficient: 1.00000 | Target: Self (1)
Name : Will of the Dawn (id=431462) [Spell Family (10)]
Effects :
#1 (id=1119262) : Apply Aura (6) | Increase Speed% (31)
Base Value: 5 | Scaled Value: 5 | PvP Coefficient: 1.00000 | Target: Self (1)
Increase Speed% is generally used by non stacking speed bonuses. It doesn’t stack with dark flight or hover either, but it does stack with exuberance.
Name : Exuberance (id=375542) [Spell Family (224), Passive]
Effects :
#1 (id=1002013) : Apply Aura (6) | Increase Movement Speed% (Stacking) (129)
Base Value: 10 | Scaled Value: 10 | PvP Coefficient: 1.00000 | Target: Self (1)
So if its meant to stack, they used the wrong aura effect.