Issei Hyoudou vanished in an unknown transport circle just before the Gremory/Phenex rating game. He reappears nearly a month later. Where was he when Rias needed him most? Issei/harem

What happens when an eventful night causes a group of D&D nerds to become adventurers and legends in the making? Well, this is that story as this world must now get ready for its most unlikely and...perverse heroes yet. Rated M for Mature Themes and Gore. Large AU from DXD, Issei X Sona and Kuroka

The Arch Artificer Manarath Frostbringer, and his wife, travel the multiverse to have a good time. Is there a reason for this traveling? What is Manarath trying to get out of this? Why take his wife? Is it a honeymoon? Who the heck knows! Certainly not Manarath nor his wife! They are just enjoying what they can!

Dragons are now extinct and a true rebirth is soon to begin, a universe is destroyed and a new race joins the supernatural scene of an already packed new world. Abandoned.

Percival Fredrickstein Von Musel Klossowski de Rolo III had no idea what was going on. Little did he know was that Allura had cast Wish... Now, in a strange new land, Percy must continue moving forward, while trying to figure out what to do now that everything he knew was gone... Wait... Why is there a floating text box in front of him? And a "Welcome to the Game!" sign?

The summary will be the first chapter, so read that instead if you're interested in fantasy violence and doomsday scenarios. This is a very broad crossover, including elements of Warhammer 40k and other things, but I can't figure out how to list it as more than 2 so I put the biggest ones for the crossover: Highschool DxD and DnD.