Techologicallyadvanced Stories

One had hands made for tinkering, but a body made to destroy the world. One had eyes that could see naught, but a mind that saw everything, a mind that could annihilate free will. One had a will of steel and a mind of stone, but had a heart of melted gold that encased and drowned anything that dared touch it. One of them must be destroyed before they destroy everything- but which one would will it be?