I used to skip Black Demons, but after I tried chaos tunnels and get 70+ crimsons a task my mind has changed. My block list is this: Steel Dragons; painfully slow exp, way too many "visage hunters", not enough spawns Iron Dragons; same reason as steels Wyverns; terrible drops, annoying and very slow exp Hellhounds; not bad exp, but ALWAYS crowded by clue hunters, also I don't do clues so their drops suck for me