Death Leeches are small cephalopodic creatures that appear in Shadow the Hedgehog. These tiny Black Arms are the immediate offspring of Black Doom and mature into full-grown Black Warriors when they feed on the blood of other life-forms. Black Doom had intended to paralyze the entire population of Earth and serve them up as cattle to his children, and almost did exactly this to Sonic the Hedgehog and his friends.
As the smallest and weakest of the Black Arms, Death Leeches pose little threat to Shadow in the game. They can easily be killed in one hit with any attack or weapon.