Achilles was a demigod. Thetis (his mother) was a Nereid and his father (Peleus) was the mortal king of the Myrmidons. Thetis was overly concerned about Achilles' mortality and immersed him in the River Styx to ensure that her son remained mortal forever. Although he immersed him in the river, he held him by the heel, thus causing Achilles to have a spot on his body considered immortal. Achilles was always in battle, showing great successes and always emerging victorious from battles. Showing his true heroism by risking his life for