Illustrate the whimsical image of an ancient quokka adorned in a regal knight's armor, standing guard in the dimly lit halls of an eerie, forgotten castle. The quokka's furry, adorable features peek out from the ornate steel helmet, its eyes gleaming with a mixture of determination and curiosity. The castle's stone walls bear the marks of centuries past, covered in intricate carvings and aged tapestries depicting forgotten battles and lost legends. Flickering torches cast dancing shadows across the vaulted ceilings, adding to the mystique of the scene. The ancient quokka's tiny paws grasp a miniature sword, a comical yet gallant sight amidst the grandeur of the crumbling castle. The air is thick with the scent of musty stone and ancient history, creating a haunting, atmospheric presence that transports the viewer to a bygone era of chivalry and valor.