The Arctic King (Overlord x Penguin Oc)

During a seasonal event in YGGDRASIL, a fortress of ice appeared in the marshy lands of the world of Helheim, guarded by penguins. Many players thought the birds were a joke of an enemy, but when waves of players struggled and failed to breach the walls, they quickly learned their mistake of underestimating the flightless birds. Not only did the birds use spears and arrows, but they also utilized rifles and armored vehicles.

It was only until the guild of Ainz Ooal Gown tried their luck did the fortress finally fall. As a reward for defeating the birds, the guild earned the dungeon they used as a base, the Great Tomb of Nazarick, along with all the loot they had accumulated. Also, completing the event on their first try garnered them the bonus reward of a small nation of penguins loyal to them. Unfortunately, the birds would never see any use as the game was declared to shut down permanently.

But now that the tomb was in an unknown world, the penguins could prove their worth. No longer being shackled by their AI, the penguins would expand and conquer the new lands in the name of their masters. Pengua would lead the nation of his kind in this endeavor making sure the name of Ainz Ooal Gown echoed forever.

Whatever the Supreme Beings needed, The Arctic Kings would get it no matter the cost. And with an army of penguins, you could do anything.

The new world will weep as destruction and mayhem plague their land.