Overlord x Youjo Senki

Overlord and Tanya

The Rhine battlefront, colloquially called the 'the Rhine where the Devil dwells', served as the border between the Empire and the Republic. In one moment, the thunder of firing artillery would boom, and in the next, a squad of soldiers would be minced into meat. Explosions shot through the sky as mages buzzed past firing mana-infused rounds. Despite being outnumbered and in a two-front war, the Empire was fighting the Republic to a standstill.

That is, until, it appeared.

A deafening earthquake shook the land between trenches. Both sides' combatants turned their heads back towards their rear. Could the impact have unearthed their trenches? But to their surprise, no damage had been done to the land. Instead, at the heart of the Rhine, a massive tomb had appeared out of the blue.

Those who were currently on the battlefield were left dumbfounded by this sudden development. The tomb's majesty would have been apparent to any onlooker, as if an ancient heritage site lost to time had surfaced overnight. However, that's only if they could see the tomb in the first place.

This was—The Great Tomb of Nazarick. A level 80+ dungeon in the DMMORPG [Yggdrasil], and the guild base of Ainz Ooal Gown. Though Nazarick was referred to as a tomb, it displayed little to no sense of the decay that typically accompanied the stench of death. It's construction had been completed in a time long past, but its white stone walls remained polished and undamaged. At the tomb's center lay a mausoleum of majestic proportions, its beauty so serene that it almost appeared foreboding. Around the grand catacombs lay two pairs of smaller crypts. Despite the fact that they were described as smaller, the crypts were in no way of a petite scale. If anything, each of the smaller crypts was so imposing and monumental that the Rhine's onlookers had anticipated them to house the kings of a long time past.

On the tenth floor of Nazarick within the Throne Room, the Guildmaster of Ainz Ooal Gown who had taken his guild's name for himself was currently observing the Rhine through the [Mirror of Remote Viewing]. To his left was the Overseer of the Guardians, Albedo. To his right was one of the other two minds that could rival Albedo's intellect in Nazarick, Demiurge. Both stood by silently as they watched their master gaze upon the mirror. The Tomb had been set to high alert, having been transferred to another world yet again. But like the first time, Albedo was sure that the one they worshipped as the Supreme Being was already formulating a plan of action in the short time since they were moved.

The Supreme Being in question was thinking this:

—Eh? Isn't this kind of bad?

Were those trenches? And were those soldiers holding machine guns? What were those cannons in the rear? From the looks of it, it was not on the level of medieval cannons anymore, those were full blown artillery batteries!

It appears that they've been caught up in the middle of an Industrial Era war.

This was seriously bad!

Worst of all, after verifying that neither side had been damaged by the earthquake, they immediately resumed combat. Of course, that was due to the illusion spells that hid most of Nazarick from plain sight but even still, Ainz couldn't wait for Sebas to finish scouting the surface. He had to act now.

"Demiurge." Ainz called out.

"Yes! What is your will, oh Supreme One?"

"Send out Mare to protect the tomb immediately. If one of those artillery shells strikes the Great Tomb of Nazarick, it won't end with someone just saying 'sorry'!"

"[Artillery Shell]? No, my apologizes, I will dispatch him right away!"

With the [Ring of Ainz Ooal Gown], Demiurge teleported to the 6th Floor to contact Mare and Aura. If it's Mare, he should be able to reshape the terrain and mitigate any physical damage to the tomb. In the meantime, Ainz had to think fast.