Create a highly detailed, professional digital painting of a close-up scene featuring an epic mecha standing on a Crystal Tree, wielding a long halberd. The mecha should have a symmetrical full-body design with visible gears and be adorned with blue delphinium flowers. A wise old man, wearing a jacket over his bare torso, should be merged with the mecha or standing nearby, positioned at a slightly elevated level. Ensure the artwork is in a hellcore style, with a focus on micro and lifelike details. The desired output should be reminiscent of the works of Artgerm, Eiichiro Oda, and Koyoharu Gotouge.