Cyconova

Cyconova
A Cyconova is the most powerful type of nova, and the rarest but most destructive type as well. It's effects can be seen in 3 different places with the naked eye from Earth.

Description
A Cyconova is when over 2 billion solar masses of matter fall into each other, and the resulting explosion coverst 99.99% of it into Energy, this immense energy can destroy everything in it's path and leaves huge black spaces where entire Galaxies used to be. They are usually caused by Galaxies colliding into each other, often when the two black holes collide. A famous example is the Venterio-Magio collsion, when 15 quadrillion solar masses collided and caused the largest recorded Cyconova, it happend 5 billion BC but it still is dissolving everything it touches, and has left a massive hole in space, over 10 billion light years in diameter, which can be seen with the naked eye, as a tiny black spot, the neares star seen in this whole, is one about 12 billion light years away, and is already being disrupted by the gravitational waves caused by this esplosion.

Graviational
When the Cyconova takes place, a huge amount of gravity is lost, so many galaxies can be affected, in the Venterio-Magio collision, 16 super-clusters were destroyed by the absence of these huge galaxies. The Gravitational waves are immense and can distort actual matter.