The one thing I learned from Fume Knight is that safety does not always lie in numbers. Summoning gives the boss more health, and Fume Knight, along with most humanoid bosses, usually like to switch aggro to the farthest person at random times; at least that's what I experienced. As for Cool Ranch Demon... -blam!- him. He seems to be another Smelter Demon, but there's something about him that makes him infinitely harder than SD; I'm pretty sure Cool Ranch's self sword buff has a longer range than normal. Wow, this post is much longer than I intended