Using an old 1D4Chan warband generator table, I have the following. Inputting this direct into Chatgpt gave the description below.
Devotion to the Ruinous Powers: Fanatic. The marines of the warband are highly devoted to their God(s), willingly submitting themselves to the Ruinous Powers and viewing possession as favourable. (if predecessor was word bearers this can be taken automatically)
What form do the Chapters' beliefs take?: Do what you want, for an Astartes is Free - These Marines are no longer bound by any laws or codes, and will do as they please when they please.
Warband Demeanor: Exploit and Conquer. The Warband views all others as mere pawns, assisting them when it helps their own goals and tossing them aside once they are no longer needed. These Marines are selfish and untrustworthy.
Corruption Above All. Marines in the Warband love being twisted by the warp, viewing mutation as a blessing and boon. They are very willing to work with abhumans, mutants and other freaks because of this. Re-roll if your Warband's devotion to chaos is "Loathed".
Common Mutations/Deficiencies: Voice of Evil
Common Mental Flaws: LOUD AND PROUD - Marines feel to need to announce their arrival to their foe, making it clear just who the hell they are and that they are here.
Special Equipment: Ancient Weaponry, Biological Experiments
Warband Status: Understrength
Cause of diminished strength: Conflicts within the Warband. Anything from the Warband fracturing to an all-out civil war.
Warband allies. Who has our back?: Specific Daemon Prince, Greater Daemon, or other powerful daemon. If your warband loathes Chaos; said daemon is covertly supporting and manipulating the warband from the sidelines to suit the daemon's needs.
In the seething depths of the Immaterium, where reality is but a fleeting illusion and the boundaries of sanity are torn asunder, there exists a warband whose very essence is a maelstrom of depravity and excess. They are The Ecstatic Peal, a once proud legion of Emperor's Children who have transcended the mere mortal coil to become avatars of Slaanesh's most twisted desires, led by the enigmatic and insatiable Chaos Lord Phodion Koronaen.
Their devotion to the Ruinous Powers is not merely fanatical; it is an all-consuming frenzy that drives them to the brink of madness and beyond. Each member of The Ecstatic Peal willingly sacrifices their very soul upon the altar of excess, welcoming the embrace of possession and mutation with rapturous delight. They revel in the agonizing ecstasy of their own corruption, their bodies contorted and warped into grotesque parodies of their former selves, adorned with blasphemous symbols of their devotion.
The warband's beliefs are not shackled by the constraints of morality or reason; they are bound only by their insatiable lust for pleasure and power. "Do what you want, for an Astartes is Free" is not merely a mantra but a divine mandate for The Ecstatic Peal, driving them to indulge in every debauched whim and desire without hesitation or remorse. They are creatures of pure hedonism, feeding upon the suffering and anguish of those unfortunate enough to cross their path.
Exploit and conquer: these words are not merely a philosophy but a way of life for The Ecstatic Peal. They view all beings as little more than playthings, to be used and discarded at their whim. They delight in the manipulation and subjugation of allies and enemies alike, weaving intricate webs of deceit and betrayal to further their own insatiable appetites for power and pleasure. Their arrogance knows no bounds, and they announce their presence with a thunderous roar that echoes through the very fabric of reality, striking fear and awe into the hearts of all who dare to oppose them.
But within the warband's ranks, chaos reigns supreme. Discord and strife are not merely tools of manipulation but cherished pastimes, as rival factions vie for dominance amidst a storm of treachery and deceit. The Ecstatic Peal is a fractured and volatile force, its unity held together by the fragile bonds of mutual ambition and fear.
Amidst the chaos, there lurks a shadowy presence, a specific Daemon Prince whose malevolent influence pervades every aspect of The Ecstatic Peal's existence. Whether openly supporting the warband's endeavors or pulling the strings from the shadows, this entity ensures that The Ecstatic Peal remains a potent force in the ever-shifting tapestry of chaos.
Armed with ancient weaponry forged in the fires of damnation and augmented by twisted biological experiments that defy all laws of nature, The Ecstatic Peal marches ever onward, a relentless tide of depravity and destruction in their wake. For them, there is no greater pleasure than the pursuit of power and the ecstasy of chaos, and they will stop at nothing to claim their rightful place as the harbingers of Slaanesh's eternal reign.
Chosen
Marines
Noise Marines
Bikers
Terminators
Havocs
Predator
Helbrute
Herald
Seekers
Daemonettes
Fiends