Overlord, Vol. 7 (light novel): The Invaders of the Great Tomb — Kugane Maruyama

A group of "workers" whose better judgement has been clouded by hopes and expectations have descended into the unknown depths of a mysterious tomb.
These trespassers include the small but elite team Foresight, the storied warriors of Heavy Masher, the crew lead by a legendary elder worker, Green Leaf, and the invincible swordsmen of Angel.
They are some of the best that can be hired, but as more and more vengeful residents of Nazarrick appear, will any make it out alive?