Harmony - Troop Symmetry

By the way, crystalline dragons have two breath effects. The first accompanies the damage dealt and is essentially a type of electricity. And the other is a purple cloud from their mouth. It might work.

Electricity is an effect that accompanies the crystalline breath itself, while the cloud might also be suitable. However, light dragons also need effects; green and purple won't work.

Added 3 minutes later
Of course, you could also attach a speed effect, reducing the scale, but that wouldn't be quite right...