Madman

A deranged lunatic driven to drag any poor adventurer who crosses his path to insanity with his great and terrible revelations. Physically, he poses very little threat, but this herald of delirium might break the will behind even the strongest of weapons. For some reason, he carries with him a strange music box, a memento of his long forsaken sanity perhaps?...

Strategy

 * The Madman poses very little danger in terms of directy bringing your heroes to Death's Door. However, if left unchecked, he will poison the mind of your adventurers and make them go off the deep end. His AOE stress attack is particularly dangerous, especially when fighting at low light, as he will deal a hefty amount of stress to the whole party. For this reason, he should be one of the main focus targets of your party attacks, eliminating him before he can inflict massive stress damage to your party members.
 * You may want to consider reducing his DODGE chance, as it is one of the highest for enemies in the game. There is nothing more frustrating than attempting to focus him down only to be rewarded with consecutive dodges. Stun is also a great idea, buying you some time before he can finally be dispatched effectively.
 * Accusation's Debuff may not seem that dangerous and it is most of the time preferred that he uses this skill instead of the AOE Stress damaging Doomsay. Be wary though of debuffs piling up and the fact that this particular Debuff will last until next camp. Moreover when using this skill he will tend to focus your already stressed out heroes, trying to make them become insane. For each dungeon level, the chance of him using Accusation on a heavily stressed hero is 2x, 3x and 4x for each corresponding dungeon.

Loot

 * He will always drop something for your party as a reward for defeating this "mini-boss". While most of the time you will only obtain a regular item, occasionaly will you receive a trinket that rarely will be one of the coveted "Music Boxes", trinkets with powerful effects on your heroes.
 * The exact probability for the Madman to drop a trinket instead of a regular provision item is 1/6 (~17%). This trinket can either be a very common, common, uncommon or Madman exclusive one (Aperture, Aria or Crescendo Box), each with the same 25% chance of being randomly picked.
 * That means, that the statistical chance of getting a Box after a Madman fight is 0.17*0.25=0.042~= 4% chance of getting that drop