Mass for the Dead

Mass for the Dead is a smartphone game based on Kugane Maruyama's Overlord novel series. The website to pre-register for the game opened on June 25, 2018. The game will be free to play with in-app purchases. The website is currently holding a preregistration campaign for 2018.

Overlord -MASS FOR THE DEAD- will soon to be available for iOS and Android. On November 8, 2018 it was announced that the game released would be delayed to early 2019.

Story
The game's plot is supervised by series creator Kugane Maruyama, and will involve the player Momonga. It was stated to be set in the world of YGGDRASIL. Alongside Momonga, you opt not to log out of the game — and find yourself in the Great Tomb of Nazarick. As Momonga, now Ainz Ooal Gown, you must face the growing threats present in the now-offline game.

Gameplay
Momonga finds himself in the ruined library of Ashurbanipal. Sensing something to be wrong he heads immediately to the 10th Floor. To his horror he finds the last defense to the Throne Room, theGolems of Lemegeton to be destroyed. Entering the Throne Rooms he finds it in ruins and hears the sounds of a battle.

Trivia

 * Those that pre-registered will have a chance to win a life-sized replica that happen to be the Staff of Ainz Ooal Gown. Pre-registration rewards will include up to 500 Chaos Stones. The Twitter campaign runs from June 25 until July 31, 2018.
 * Voice actors from the Overlord Anime will be returning to play their roles in the game. They will also be offering autographed cards as giveaways for the game's pre-registrations Twitter campaign.