Chaos Monk
Surprisingly not a Warhammer thing.
The Chaos Monk is a Monk Variant Class in Dungeons & Dragons 3rd Edition found in the pages of Dragon Magazine #335. Given very little lore, all we know about them is that they preach that ki can be felt more freely and flows more potently when it is untamed, causing them to embrace chaos and anarchy over the rigid discipline of most monks... basically, this is the "Anti-Monk", in a sense.
As a variant class, Chaos Monks use the same rules and chassis as the regular monk, with the following exceptions:
- Alignment Requirement is Chaotic, not Lawful, obviously!
- At 1st level, replace Flurry of Blows with Flailing Strike.
- At 5th level, replace Purity of Body with Erratic Advance.
- At 7th level, replace Wholeness of Body with Displacing Stance.
- At 10th level, replace Ki Strike (Lawful) with Ki Strike (Chaotic).
- At 11th level, replace Diamond Body and Greater Flurry with Freedom of Thought and Greater Flailing.
- Lose Abundant Step at 12th level.
- At 20th level, replace Perfect Self with Anarchic Self.
Flailing Strike (Ex) is your signature class ability, which lets you make a level-based number of random attacks as a full-round action. Like Flurry of Blows, it can only be used with unarmed attacks or when armed with special monk weapons (aka, anything that lets you use it for FoB). All attacks in a Flailing Strike suffer a -2 attack penalty, which decreases to -1 at 5th level and is removed entirely at 9th level. A Flailing Strike is 1d4-1 attacks at 1st level, 1d4 at 5th level, 1d6-1 at 10th level, and 1d6 at 15th level.
We're not actually told what Greater Flailing is in the article, but given that it's the Chaos Monk's version of Greater Flurry, presumably it's the exact same "you get an additional extra attack at your full base attack bonus" as Greater Flurry.
Displacing Stance (Sp) lets you use a standard action to displace yourself, causing enemies to have a 20% chance to miss you with their attacks (50% from 12th level). You can use this for rounds per day equal to 1/2 your chaos monk levels, but they don't have to be used consecutively.
Freedom of Thought (Su) lets you reroll a failed Will save against a mind-affecting effect 1/day with the exact same modifiers as the original save; the second result stands, even if it's also a fail.
Anarchic Self (Su) is literally the same thing as Perfect Self, except you gain the Chaotic subtype instead of the Lawful subtype.