The Choirmaster's Cowl is a Demon Unique helm with no boss attached: it drops anywhere in Hell, most often from H3 up (rarer below that home difficulty, never above it), and nowhere else. Every copy is item level 110, and there 0.2% of what falls comes up Unique. It is built on Sovereign Spiritcowl Helm — step 6 of the Spiritcowl Helm line, item level 80 and up.

It always rolls the same numbers: +90 Ward, +327 Maximum Health, +54 Ward, +54 Magic Defense, +45% Summon Damage, +594 Maximum Health and +64% Ultimate Generation.

One Unique drop in 40 is a Mythical copy: the same item carrying 15–25% Mythical Energy that boosts every stat on it and can never be changed; the 15% floor is 10 times as common as the perfect 25%.

On top of that it carries The Choirmaster's Cowl — Your Ultimate's spirits strike from twice as far, spread 50% wider and last 30% longer (summon abilities only).

“Sing from the back. The back is where the choir is.”