Deathmen are first encountered on 20F in Etrian Odyssey II: Heroes of Lagaard.Most of the time they will use normal attacks for decent damage. Rarely they will make use of their Edge skill, which deals damage to the entire party and has a chance to instant kill. While the risk of being insta-killed is scary, they rarely tend to use Edge and instead rely on normal attacks to deal damage. With a proper trained and equipped party, this enemy shouldn't be a threat at all.