Four War Gods

The Four War Gods are a group of yokai demons from the Inuyasha anime. Their one and only appearance is in the movie The Fire on Mystic Island. They sought to regain the power they lost to the Priestess Kanade by sacrificing the hanyou children they possess on Horai Island. Their names are Ryura, Jura, Gora and Kyura.

Story
(Warning: Spoliers follow!) Long ago, Horai Island was a haven for the hanyou population that lived there from being prayed on by other yokai demons. However, every 50 years or so, the barrier that kept the island hidden from oridinary space and time would break down, allowing demons from the mainland to attack. The Four War Gods were among these demons. They caused enormous bloodshed and in the end gained control over the island. However, despite their apparent victory, Kanade succeeded in sealing their respective power spheres in a sacred comb box that could only be broken by herself or a respective priestess, keeping the Gods away from their full power and in so doing allowed the hanyou population to have some peace. Unfortunately though, the Four War Gods discovered that by sacrificing hanyou individuals to a sacred cauldron on the island, they could regain a small portion of their power each time. To carry this out, they marked several hanyou children on the island with their crimson scar to keep them from leaving the island, in a sense sealing their fate.

Inuyasha and Kikyo at one point tried to stop them, but failed in their mission. Inuyasha was marked by Ryura with a crimson scar, and Gora sucked some of Kikyo's blood to be put to later use. Sesshomaru also tried to take on the Four War Gods, taking on Kyura after he killed two demons that once served under Inu no Taisho. However, like Inuyasha, Sesshomaru also received the crimson scar.

After saving a hanyou children from the cauldron and receiving the comb box from the spirit of Kanade, Inuyasha lost it to a doppleganger of Kikyo (made from the blood Gora stole) who stole the box and ended up opening it for the War Gods. With their true power returned, the Gods began going on a rampage, planning to wipe out the population on Horai Island before leaving. However, their arrigance ended up being their undoing as Inyasha defeated Ryura and Gora with Tesseiga, Miroku and Sango defeated Jura by having Gora fire on him, and Sesshomaru wiped out Kyura with Dragon Strike. However, even though they were defeated individually, the gods came back in a unified form that at first gave the group problems with their combined powers, until Inuyasha and Kagome combined their powers to finish it off. With the Gods' defeat, the hanyou children were finally able to leave the island and live peaceful lives.