Space Marines, gg 2 ez Space Marines are genetically modified humans and range from 7-10 feet tall. They have 2 hearts, 3 lungs, and more implants. They can breathe almost anything and their bones are nearly unbreakable. They are practically immortal, They can spit acid, see in near complete darkness as well as they would in daylight, and in some cases, see outside of the visible spectrum , eat any living thing and gain it's strengths and know it's weaknesses, have skin resistant to radiation, survive in the vacuum of space, go for weeks without sleep, examine somethings toxicity and vitamins just by smelling it, and have sick power armor that is connected to their nervous system