Rogues of the Grail

From the publisher:

You take on the role of a member of the secretive Thieves' Guild known as the Khumran's Hand, an ancient brotherhood of rogues who have spent centuries searching for the elusive Holy Grail. This fabled relic is said to grant unimaginable power to those who possess it, but its pursuit has brought the guild nothing but curses, madness, and betrayal. Amidst the backdrop of crumbling castles, haunted forests, and plague-ridden villages, the player must navigate a world where every ally is a potential enemy, and every step forward may lead to doom.