In reference to the episode, two appeared and I normally remove one, but my healers was capable of out-healing one guy and I locked down the other one. I don't mind him, mainly because I bring a lot of control to my teamcomp that results in him being a useless body that reduces the chance of Collector summoning more heads. Many consider him the biggest threat due to his high speed and the AI's propensity to target low-HP characters. This is where a majority of this fight's damage comes from, and depending on how many bandit heads are on the field it can range from an easy fight to a bloodbath. His only attack is Headhunt, which does a decent amount of damage, has a respectable crit rate, and can bleed. The Collected Highwayman is a man of variable threat level to other players and me. The rest of the Collector's 'attacks' comes from his cohorts. Suffice to say, Lifesteal is his worst attack just by merit of making the fight longer. Comparatively, Life Steal has a high damage range, high crit rate, can bleed and mark the victim, and worse off heal the Collector for 10 HP. His most used attack is Show Collection, which hits your front two ranks for ~10 stress damage, but does nothing else so its something you hope for. His other attacks can range in threat value depending on the situation.

Collector will open up the fight with this skill, and will use this skill in elevated frequency as you kill more of his summons. Said attack, known as Collect Call, will summon three heads in varying amounts from the classes that you pick up heads from in secret rooms. Based on the Yellow King, this midboss is primarily a summoner and will more than often spend time refreshing his minions should he ever find himself in short company. The Collector is a midboss seen randomly in the dungeon, and is set to appear once you have more than half your inventory full. If anyone finds a source I will credit them) The Collector

The collector darkest dungeon