High School DxD is a Japanese light novel series written by Ichiei Ishibumi and illustrated by Miyama-Zero. The series revolves around Issei Hyoudou, a perverted high school student who is reincarnated into a Devil by Rias Gremory after being killed on his first date. He later joins the Occult Research Club as he strives to rise up the Devils' ranks to fulfill his dream of building a harem and becoming a "Harem King".
Power of the Verse
The Highschool DxD Universe is full of Gods from various Mythologies, along with Dragons, Devils and Angels. Beings like Great Red and 666 (Trihexa) are stated to be able to destroy the world in their clash. There are decent hax like Divine Dividing which reduces an opponent's power and size, destroys their soul with a special poison and erases them from existence.
Also many characters are able to travel through dimensions and BFR to another dimension. There are also users who can create magical barriers and teleport to different locations. Sirzechs with his Power of Destruction can eliminate things without a trace, not leaving even dust returning them to nothingness and Balance Breakers (especially those of the Heavenly Dragons) can be considered hax enough to superpower their wielders, either by stealing others' power or boosting their own power.
Other abilities include being able to bypass defenses, Darkness Manipulation (which possibly devours down to the soul simultaneously nullifying powers and regeneration), Purification, Illusion Creation, Petrification, Fire Manipulation (some of which cannot be extinguished, burn down to the soul, negate other fire based attacks and continue burning in the event of the user's demise), Mind Manipulation, Memory Manipulation, Dream Manipulation, Barrier Creation (which negates the damage from an attack itself), Space-Time Manipulation, Power Nullification, Anti-Magic, Time Stop, Necromancy (which grants the revived characters regeneration and eliminates their weaknesses), Curse Manipulation, Attack / Damage Reflection, Sealing, and many others.
Supporters and Opponents of this Verse
Le Fay Pendragon
Four Great Satans