Dungeon Majesty is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

'Oh Ju-Yoon' is your typical, everyday part-timer. He dies in a coincidental accident, but because of his kindness, he is given another chance to live in a new and different world. However, his future is neither as a hero, nor mage... but a creature at the bottom of the food chain, 'Brick Eater', meeting an atrocious crisis?! Surreal events! An unexpected level up fantasy!