Highschool DxD & Darksiders crossover with hints of DmC Devil May Cry and Diablo series
Basically 6 of the 7 seals have been broken like in canon Darksiders with most of humanity extinct and the demons/devils ruling the Earth.
An OC (who'll take Issei's place) is supposedly one of the few remaining humans left standing do to him managing to unlock Boosted Gear.
Eventually he comes across War (who will be female in this fic) and after some hostilities he will end up travelling with her to help her with her quest of vengeance/proof of her innocence.
Eventually they come across some surviving humans (Kat from DmC as well as Xenovia & Irina to name a few) with Kat deciding to travel with them.
During a fight with Vali it's revealed that he's only half human and that the other half is that of a Nephaelem (his father being Al'Diabalos the Lord of Terror and his mother being the half human daughter of the Archangel of death Malthael)
He'll eventually manage to master the powers he inherited from his father & grandfather just in time to help War fight Abbadon the Destroyer.
Other than Boosted Gear he will have Rebellion (the one from DmC) which will allow him to channel holy & demonic power. Eventually War will give him Chaoseater.
Ok the rules of this fic (if anyone decides to try this before I do) are:
1. The main pairing must be OCxFemWarxKat. If you decide to make this a harem than it has to be an unwanted one for amusement purposes.
2. He must at some point have a meeting with either his father or grandfather in order to further his growth.
3. The ORC group have to be enemies (whether they become allies or not at some point is up to you)
4. Other than War no other male characters should be genderbended (if you want to than you'll have to take it up with me to come at an agreement.
The rest is up to you if I end up not making this.