This is an Illustrious style lora for the character Ultron from Marvel Comics. Specifically the look of Ultron Phalanx from the Phalanx themed Annihilation Conquest storyline from around 2007.
A weight of 1 to 1.5 works well with this with most models with best results around or near 1.35. Sampling Steps of 15 to 35 works well with most models, as does a CFG Scale of 3.5 to 7.5.
Prompts for this lora are ( Ultron Phalanx, muscular, robot, ).