Sigil is a city run by and for the Factions, and life is easier in most quarters when a body's a member of one. Most services in the city (libraries, workshops, alchemical laboratories, craft guilds, healers, etc.) are dominated by the Factions. As such, they usually favor their own and charge outsiders a premium. Factioned PCs can seek out fellow members to keep prices low, but PCs without a Faction will often have to pay higher than the listed book price for certain services (GMs fiat). Regular market goods don't typically apply, so a PC buying a sword or a meal or a night at an inn will usually pay standard prices.

On the other hand, Factioned PCs (with the exception of Indeps) are subject to the hierarchy and politics of their Faction. When called upon to do a mission or serve a higher ranking member, they're expected to obey. And when dealing with the other Factions around Sigil, they need to be careful not to make friends (or enemies) with the wrong person.

Athar:

• + Gain Spell Resistance equal to 10+character level versus Divine magic​
• - Divine spellcasters who worship a deity must refuse to offer any magical aid to Athar characters​

​ Believers of the Source:​

• + Initial Attitude of most NPCs is one step better than usual (Indifferent to Friendly, etc)​
• - Cannot be Raised or Resurrected by any means (but can be Reincarnated)​

​ Bleak Cabal:​

• + Immune to spells causing madness or insanity (Confusion, Feeblemind, Hideous Laughter, etc)​
• - At the start of each day, roll 1d20. On a natural 1, suffer from depression for the entire day (as Crushing Despair spell, no save, cannot be removed)​

​ Doomguard:​

• + Gain proficiency with a single Martial Weapon, and gain Weapon Focus for that weapon as a bonus feat​
• - Must FAIL a Will save against magical healing to receive benefits​

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Dustmen:​

• + At the start of an encounter, all Undead ignore the Dustman character until it either attacks them or aids others in attacking them​
• - Must FAIL a Will save against Raising, Resurrection, or Reincarnation to gain the benefits​

​ Fated:​

• + Choose any three cross-class skills, and treat them as class-skills [NOTE: this is changed from previous rules for balance issues, please use this version going forward]​
• - Cannot accept or perform charity in any capacity.​

​ Fraternity of Order:​

• + Gain “Comprehend Languages” as a spell-like ability, once/day, caster level equal to character level​
• - Cannot knowingly break any law, no matter the source or nature of that law.​

​ Free League:​

• + Gain +2 bonus to saving throws versus mind-control and compulsion effects. If no save is allowed, gain a save at no bonus.​Get a 10% discount/bonus when buying/selling items in any Free League controlled market (Sigil's Grand Bazaard, Tradegate)​
• - Treated as non-Factioned in terms of other rights and benefits in Sigil (courts, libraries, resources, etc)​

​ Harmonium:​

• + Gain “Charm Person” as a spell-like ability, once/day, caster level equal to character level​
• - Must obey Faction superiors' orders without question, or lose all benefits until an atonement spell is cast by a Faction cleric. Characters refusing to atone are automatically sentenced to death by the faction.​

​ Mercykillers:​

• + Gain “Discern Lies” as a spell-like ability, once/day, caster level equal to character level​
• - A Mercykiller who breaks the law outside of their duties must accept the punishment or lose all membership and benefits. Similarly, captured lawbreakers cannot be released for any reason until proper sentence is carried out, at the same penalty.​

​ Revolutionary League:​

• + True Faction membership cannot be discerned by magical means. Any magical effect that would reveal the character's true Faction allegiance is automatically fooled, instead revealing a Faction of the character's choice.​
• - Cannot hold public office or noble title, own a business, or other participate in any authoritarian power structure. 90% of all treasure gained must be donated to the poor and oppressed.​

​ Sign of One:​

• + When encountering any illusion, automatically gain a saving throw to disbelieve​
• - Initial Attitudes of most NPCs are always one step lower (Indifferent to Unfriendly, etc)​

​ Society of Sensation:​

• + Gain Darkvision 60ft, and +1 bonus to all saves vs poison​
• - Cannot refuse to engage in a new experience unless it involves obvious deadly peril.​

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Transcendent Order:​

• + Gain “Improved Initiative” as a bonus feat​
• - Players cannot take back actions once stated. No take-backs.​

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Xaositects:​

• + Gain a unique spell-like ability once/day, caster level equal to character level. “Babble”, Sor/Wiz 3, identical to the “tongues” spell except as follows: This spell denies the touched creature the ability to speak or understand the language of any intelligent creature. Other creatures hear only babble. The subject is unable to cast spells with a Verbal component until the end of the duration. ​
• - Cannot found businesses, build strongholds, raise armies, or undertake any other action that requires long-term organization and discipline.