Once a year, the restless Oni demons rise from the Underworld to participate in glorious battle. They may be summoned to the battlefield through the use of magical artifacts known as demon gates.
Continue the fight in the Pacific Front by summoning Oni demons through the construction of Demon Gates. Slay 100 Oni demons to gain permanent access to the Cleansed Demon Gates for Defense in Depth, Sector Defense, and United Front missions.
Cleansed Demon Gates will summon allied Oni demons who will permanently augment the player's forces for the rest of the year.