Warning: This guide was prepared for game version number 21142 (it is the last version before introduction of "The Color of Madness" DLC) and now can be outdated. I will try to update it soon.

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Here are the party setups which killed Champion bosses in my Darkest campaign. I will add more descriptions and information as soon as I find more time and/or do some progress myself. Every party is presented in rank 4 / rank 3 / rank 2 / rank 1 order. I hope this topic will help other players and be a start to some interesting discussions as well. :)

Necromancer Lord - Vestal / Man-at-Arms / Crusader / Leper (aka "The Wall") - more info

Gibbering Prophet - Vestal / Man-at-Arms / Crusader / Leper (aka "The Wall") - more info

Swine God - Vestal / Man-at-Arms / Crusader / Leper (aka "The Wall") - more info

Formless Flesh - Houndmaster / Vestal / Houndmaster / Man-at-Arms - more info

Hag Witch - Vestal / Houndmaster / Man-at-Arms / Hellion (aka "The Hunting Hounds of Hell") - more info

Brigand 16 Pounder - Vestal / Houndmaster / Man-at-Arms / Hellion (aka "The Hunting Hounds of Hell") - more info

Beguiling Siren - Vestal / Houndmaster / Man-at-Arms / Hellion (aka "The Hunting Hounds of Hell") - more info

Drowned Crew - Vestal / Houndmaster / Man-at-Arms / Hellion (aka "The Hunting Hounds of Hell") - more info

Abhorrent Shambler - Occultist / Jester / Abomination / Hellion (probably, read the info below)
So far I've never bothered to hunt and kill Champion Shambler because Apprentice and Veteran versions of this boss give the same rewards. If I was going to I would probably use similar setup (mentioned above) as for other difficulties.

The Collector - any party with a some stun skill
So far I've never had any problems with this boss. Collected Highwaymen are always my first targets then The Collector himself. I'm leaving alone any Collected Vestals and/or Collected Men-at-Arms till the end of fight for HP and stress recovery (just use stuns to break any guards).

Brigand Vvulf - Vestal / Jester / Houndmaster / Man-at-Arms - more info

Horrid Shrieker - (this boss is still alive...)
So far I've only killed the Nests and haven't got enough time/turns left to finish the boss.

Formless Flesh - Houndmaster / Vestal / Houndmaster / Man-at-Arms

rank 1: Man-at-Arms
- Combat Skills: Crush / Rampart / Defender / Bolster
- Camping Skills: Encourage / Tactics / Instruction / Weapons Practice
- Trinkets: Wilbur's Flag / Ancestor's Signet Ring

rank 2: Houndmaster
- Combat Skills: Hound's Rush / Hound's Harry or Target Whistle / Lick Wounds / Blackjack
- Camping Skills: Encourage / Hound's Watch / Therapy Dog / Release The Hound
- Trinkets: Ancestor's Coat / Ancestor's Pistol

rank 3: Vestal
- Combat Skills: Judgement / Dazzling Light / Divine Grace / Divine Comfort
- Camping Skills: Encourage / Bless / Chant / Pray
- Trinkets: Ancestor's Scroll / Sacred Scroll

rank 4: Houndmaster
- Combat Skills: Hound's Rush / Hound's Harry or Target Whistle / Cry Havor / Lick Wounds
- Camping Skills: Encourage / Hound's Watch / Therapy Dog / Release The Hound
- Trinkets: Ancestor's Musket Ball / Prophet's Eye

Brigand Vvulf - Vestal / Jester / Houndmaster / Man-at-Arms
note #1: Camping skills are irrelevant as there is no camp during this mission.
note #2: My Jester was at level 4, he got level 6 after this mission.

rank 1: Man-at-Arms
- Combat Skills: Crush / Rampart / Defender / Retribution
- Trinkets: Flesh's Heart / Ancestor's Signet Ring

rank 2: Houndmaster
- Combat Skills: Hound's Rush / Guard Dog / Lick Wounds / Blackjack
- Trinkets: Ancestor's Musket Ball / Ancestor's Pistol

rank 3: Jester
- Combat Skills: Harvest / Slice Off / Battle Ballad / Inspiring Tune
- Trinkets: Bleed Amulet / Lucky Dice

rank 4: Vestal
- Combat Skills: Judgement / Dazzling Light / Divine Grace / Divine Comfort
- Trinkets: Ancestor's Scroll / Sacred Scroll

Update: I've killed Beguiling Siren with The Hunting Hounds of Hell party.

Update: I've killed Drowned Crew with The Hunting Hounds of Hell party.