With the rading game over and Riser winning the wedding continues and you decide to stay home because you had to think about what losing meant for the future. Just then a circle for Riser appeared.

Meanwhile at the wedding Issei challenged Riser to a fight but failed and was saved by Rias begging Riser to spare his life and Riser let him live but before the wedding could continue a circle for Riser appeared as Riser started to smile.

Rias pov

Rias: Where we're they during this whole thing?

Riser: I sent them on a little errand to visit that friend of yours (Y/N).

Before the girls could go through the portal a black mist came through confusing everyone. As the girls came through they had the mist all over them with their skin turned slightly purple. As they came through so did you came through to but with purple horns coming out of your forehead.
The horns surprised everyone but Riser was surprised to see that your still alive.

(Y/N) pov

Riser: How are you still living?

(Y/N): I am more skilled than you think and that mist is a little something I call the Frenzy Virus.

I then order Riser's peerage to attack him not by saying it but by ordering it with the virus.

They all start attacking Riser with no mercy but as they did he knocked them down one by one until that were all on the ground.

Riser: Undo what you did to them at once.

You do so as they were transported away to recover meanwhile your body starts to grow with two arms coming out of your back with wings. You start to say in a deeper voice.

(Y/N): You beat that dragon but see if you can do the same to this monster.

Your skin starts to transform into black scales as you go on all fours and you grow a tail while your neck gets longer. After a few seconds your transformation is complete and you are a Gore Magala

After what you let out a roar that made Riser cover his ears.

After that you charged at him but just missed as you use your back arms to grab him and throw him into the ground as you hold onto him and smash him into g the ground many times before your throw him to the side. Just then he recovered but as he got up you shot balls of dark orbs at him as he flies up you do so to and grab him in your mouth as you bite off his let.

After you did so his sister flies infront of you to try and stop you. You did stop but the purple mist returned and a she was breathing it in she began to feel angry. Soon her skin turned slightly purple as she was infected with the Frenzy Virus and she looked at you then at Riser. She than began to attack him when he was just barely holding onto his life you take away the virus and she realizes what she was doing and quickly flew away in fear with Riser in her arms.

Aftwr she left you begin to turn back to normal as Rias and her peerage show up to ask you a bunch of questions like "What was that?" and "What did you do to them?" and "Are their other monsters that have that kind of power?"

(Y/N): First that monster was Gore Magala, second I just infected them with a virus that make the infected extremely violent and third there are other monsters called Elder Dragons that are just as powerful if not more powerful.

a/n: Thanks to everyone reading along with those who voted for the monster. If their are any monsters you wish to see that comment and I will work my way to them but might not be in the very next chapter from when you comment so give me time.