Doufu Mayoi 
Black Summoner: Volume 14 [EPUB ebook] 

At last, the final confrontation is upon us. Having finished their preparations, Kelvin’s force musters in Toraj before setting out to take on what could be the final boss! With help from each nation and all the Dragon Kings in tow, Kelvin seems to stand a decent chance with his plan to take down the enemy battleship, the Elpis.

But he also has to contend with the final boss, Dark Mel, as well as her powerful minions: Tristan, Riold, and “Sachiel.” Tristan seems to have a new trick up his sleeve, while Riold and Sachiel have yet to reveal their true strength! That, and an unknown amount of angel “monsters” accompany other surprises in store. How will Kelvin and his party fare?