Edit the skull robot tank to have 4 distinct arms, each hand holding a different weapon: a large industrial blade (not a sword), a blaster, a menacing syringe, and a claw. All exterior metal is shiny silver grey, inner parts are dark grey, with no blue or orange tints anywhere. Weapons and sharp claws are forward, ready to attack. Maintain retro stickers style, clean outline, compact proportions, and transparent background.emoji