Strange little idea I had for an secret deity that I may or may not use in upcoming session.
Athemaan
Alignment: CN
Portfolio: The Insane, Random Chance, Cowards
Domains: Madness, *(see below)
Worshipers: All unwilling
Favored Weapon: War Razor
Holy Symbol: An entwined centipede devouring itself
Athemaan is a god who makes his home in the minds of the insane, unlike those of Lamashtu's creed who use their madness to fuel their Goddess's dark intentions, Athemaan is a god who appears content to simply enjoy the splintered minds of the masses. Making his home entirely in the psyche of mortals, Athemaan is probably the most active in the day to day lives of his worshipers, appearing to them in their madness, constantly offering inane advice or psychotic suggestions. A god of untested power, the true problem for his worshipers is the fact that their god is only visible to the faithful, and even then they all see him as a different entity, whispering separate nonsense into each of their skulls. Compounded with this, no one sane appears able to comprehend that the deity actually may exist, even the gods are either unable or unwilling to acknowledge the mad god's existence.
Appearances naturally vary from psychosis to psychosis, Athemaan appears to favor the forms of a shower of centipedes, a fang-toothed squirrel, or an infant with the head of an ocelot. While his area of expertise may border on the other gods, the border between his domain is still quite clear, while someone like Nivi Rombodazzle may bless someone with a good roll of the dice, all while the dice are still rolling is where Athemaan dances. When Lamashtu inspires madness in a husband to kill his daughter and wife, Athemaan is the one who snaps open his mind like a jigsaw puzzle when he is holding their broken bodies. Athemaan is both kind and cruel, and while his presence in their mind may be unwelcome, at least they will never be alone in their insanity.
Lore:
Rovagug and the Trickster: This story was originally find scrawled in its author's blood on the walls of an asylum. The text tells of a young trickster god who prepared for battle with the rest of the gods against Rovagug. However upon seeing the great beast, the trickster was became terrified and fled. While he ran he came across a mortal, a seer whose mind had broken when he saw a vision of Rovagug. Seeing this mortal's splintered psyche as the perfect place to hide, he dove into the creature's mind. The young trickster had planned on leaving once the battle had been decided, however when he entered into this Insanity Plane, he mind soon also succumbed, so there the trickster stayed.
*Domains Note: All followers of Athemaan gain the Madness Domain, for your second domain you should roll a die to select your second domain out of the others or if your GM decides you may instead select one yourself. A cleric of Athemaan can never have the Law Domain, Inquisitors of Athemaan must use the Madness Domain, and may not roll or select a secondary Domain and instead use that one
I dislike that you break the 4th wall and include it in your description.
-> Rolling dice in that of the gods description just kind of ruined it for me.
I suppose the concept is very cool though. Your grammar or wording could use some work. However, who's can't? Mine probably could use some fixes too.
I have a similar deity in my home-brew game. He's also CN and his symbol is two hands drawing each other (think MC Escher) but I gave him these domains: Chaos, Charm, Luck, Madness, and Trickery (he appears as fey creatures a lot). I may steal your idea about his Clerics having to have Madness as 1 domain and then rolling a die to pick their second domain (I'd probably just do a d4 with his other 4 domains though). I don't know why but I gave him Bolas as his favored weapon, it just seemed like something insane people would use.
I wasn't attempting to break the fourth wall there Eyolf, I was merely trying to show an example of the Random Chance side of his portfolio, I had been attempting to allude to gambling dice.
the favored weapon was odd to pick for him, I wanted him to have something unique, so I went with the war razor just because I could see far too many of his clerics who take their own life with it.
I also have changed my mind a bit on the domains thing, what I decided with my group is that every day when you prep spells you roll on a chart of the domains and you get that domain until you prep spells again. The chart itself contains every domain besides law and madness for obvious reasons.