Based on the system in Mythic Odesseys of Theros
Piety
Piety has nothing to do with faith or belief, except insofar as a person’s thoughts and ideals drive them to action in a greater being’s or an ideal's service. A character's piety score reflects the actions they have taken in their greater being’s service.
A character typically can have a piety score no greater than their highest mental stat (intelligence, wisdom, charisma), which is referenced as your piety modifier and piety score plus their proficiency bonus. Notable exceptions are clerics, paladins, and warlocks. Those of the listed classes devoted to a greater being automatically increase their maximum piety by an amount equal to the level(s) they have in the listed classes. For example, a 4th-level cleric with a wisdom score of 16 has a starting piety score of 4 and a maximum of 20. An aasimar character has their maximum piety score increased by 5, no matter which greater being they give piety to.
When a player is making their character, the character's base piety equals their proficiency bonus.
Other relevant knowledge:
- A character can only benefit from one greater being's domains at a time (for example, if a 10-piety follower of a god that has two domains can choose either domain but not both to gain benefits from)
- A character gains benefits when their piety score crosses certain thresholds: 5, 10, 20, and 30. If a character's piety score exceeds and then drops below one of those thresholds, they lose the benefit they gained at the higher tier
- A character's spellcasting for any spells is your piety modifier
- If a spell gained is a ritual, a character can cast it as a ritual as normal but still requires material components if any are needed
- When a character switches their piety from one greater being to another, they start with the lowest piety possible for their class
Gaining/Losing Piety
A character's piety score increases by 1 when they do something to advance the greater being’s interests or behave in accordance with the greater being’s ideals. The greater beings expect great deeds from their champions, so your piety score typically increases only when you accomplish an important goal (such as the completion of a quest), make a significant sacrifice of your own self-interest, or otherwise when the DM sees fit. The DM decides the amount of any increase or decrease, but a single deed typically changes your piety score by only 1 point in either direction unless your action is very significant. The DM is encouraged to let the players know when they gain or lose piety but is not required to. A character's piety should be expected to increase by 1 every two to three sessions of play if the character is properly devout and their actions are in accordance with the ideals of their greater being.
Typical ways to increase piety:
- Gain a substantial amount of followers in the greater being's service
- Constructing or restoring a shrine or church to the greater being
- Enforce a main tenant or ideal of the greater being
- Defeating or thwarting the schemes of enemies of the greater being
Typical ways to lose piety:
- Act directly contrary to the greater being's tenants and ideals
- Harm another follower of the greater being
- Ruin a sacred place or place of worship to the greater being
- Forsaking duties imposed by the greater being for personal gain
Any spells below can be cast through spell slots of a sufficient level if you have them.
Domains
Benefits gained are mostly dependent on the divine domain(s) that a greater being inhabits.
Arcana
5+ Piety. You can cast a 2nd level or lower spell without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest.
10+ Piety. You can cast a 3rd level or lower spell without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest. You gain advantage on Arcana checks and can enchant items in half the time.
20+ Piety. You can cast a 4th level or lower spell without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest.
30+ Piety. Increase your piety's ability score and its maximum by 2.
Death
5+ Piety. You can cast Inflict Wounds or Ray of Sickness without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest.
10+ Piety. You can cast Vampiric Touch or Animate Dead without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest. If you cast Animate Dead, the level equals your proficiency bonus (minimum of 3rd)
20+ Piety. You can cast Blight without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest.
30+ Piety. Increase your piety score and its maximum by 2.
Forge
5+ Piety. You can cast Heat Metal without expending a spell slot or requiring material components. Once you do so, you cannot do so again until you finish a long rest.
10+ Piety. You can cast Elemental Weapon without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest. You can craft, repair, upgrade, and enchant items in half the time it normally takes.
20+ Piety. You can cast Fabricate without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest.
30+ Piety. Increase your piety score and its maximum by 2.
Grave
5+ Piety. You can cast Gentle Repose without expending a spell slot or requiring material components a number of times equal to your piety modifier (minimum of once). You regain all expended uses at the end of a long rest.
10+ Piety. You can cast Speak with Dead without expending a spell slot or requiring material components. Once you do so, you cannot do so again until you finish a long rest. Once per turn, when you hit an Undead with an attack, you can deal
1d6 radiant damage to the Undead.
20+ Piety. You can cast Death Ward without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest.
30+ Piety. Increase your piety score and its maximum by 2.
Knowledge
5+ Piety. You can cast Comprehend Languages or Identify a number of times equal to your piety modifier (minimum of once) without requiring material components or expending a spell slot. You regain all expended uses at the end of a long rest.
10+ Piety. You can cast Augury, Legend Lore, or Tongues without expending a spell slot or requiring material components. Once you do so, you cannot do so again until you finish a long rest. You can understand the literal meaning of any writing in any language.
20+ Piety. You can cast Private Sanctum without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest.
30+ Piety. Increase your piety score and its maximum by 2.
Life
5+ Piety. You can cast Healing Word as a second-level spell without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest.
10+ Piety. You can cast Mass Healing Word without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest. A number of times equal to your piety modifier per day when you heal a creature, they regain an additional
1d8 hit points.
20+ Piety. You can cast Revivify without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest.
30+ Piety. Increase your piety score and its maximum by 2.
Light
5+ Piety. You can cast Scorching Ray as a second-level spell without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest.
10+ Piety. You can cast Daylight or Fireball without expending a spell slot. Once you cast either spell, you cannot do so again until you finish a long rest.
20+ Piety. You can cast Dawn without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest.
30+ Piety. Increase your piety score and its maximum by 2.
Nature
5+ Piety. You can cast Speak With Animals a number of times equal to your piety modifier (minimum of once). You regain expended uses at the end of a long rest.
10+ Piety. You can cast Barkskin or Spike growth without material components or expending a spell slot. Once you do so, you cannot do so again until you finish a long rest. You can cast Absorb Elements without expending a spell slot a number of times a day equal to your piety modifier.
20+ Piety. You can cast Plant Growth without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest.
30+ Piety. Increase your piety score and its maximum by 2.
Order
5+ Piety. You can cast Command without expending a spell slot a number of times equal to your piety modifier (minimum of once). You regain expended uses at the end of a long rest.
10+ Piety. You can cast Zone of Truth or Slow without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest. You regain expended uses at the end of a long rest. You have an extra +2 to Persuasion and Intimidation checks.
20+ Piety. You can cast Compulsion or without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest.
30+ Piety. Increase your piety score and its maximum by 2.
Peace
5+ Piety. You can cast Sanctuary without expending a spell slot or requiring material components a number of times equal to your Wisdom or Charisma modifier (minimum of once). You regain expended uses at the end of a long rest.
10+ Piety. You can cast Beacon of Hope or Warding Bond without expending a spell slot or requiring material components. Once you cast either spell, you cannot do so again until you finish a long rest.
20+ Piety. You can cast Aura of Purity without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest.
30+ Piety. Increase your piety score and its maximum by 2.
Tempest
5+ Piety. You can cast Shatter without material components or expending a spell slot. Once you do so, you cannot do so again until you finish a long rest.
10+ Piety. You can cast Call Lightning without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest. You have the benefits of a Ring of Feather Falling.
20+ Piety. You can cast Control Water without material components or expending a spell slot. Once you do so, you cannot do so again until you finish a long rest.
30+ Piety. Increase your piety score and its maximum by 2.
Trickery
5+ Piety. You can cast Phantasmal Force without requiring any components. Once you do so, you cannot do so again until you finish a long rest.
10+ Piety. You can cast Major Image without expending a spell slot or requiring any components. Once you do so, you cannot do so again until you finish a long rest. Once per day, you can use a bonus action to turn Invisible until the start of your next turn.
20+ Piety. You can cast Dimension Door without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest.
30+ Piety. Increase your piety score and its maximum by 2.
Twilight
5+ Piety. You can cast Faerie Fire without expending a spell slot or requiring material components a number of times equal to your piety modifier (minimum of once). You regain expended uses at the end of a long rest.
10+ Piety. You can cast Tiny Hut without expending a spell slot or requiring material components. Once you do so, you cannot do so again until you finish a long rest. You can see normally in dim light and darkness out to 60 feet.
20+ Piety. You can cast Greater Invisibility without expending a spell slot or requiring material components. Once you do so, you cannot do so again until you finish a long rest.
30+ Piety. Increase your piety score and its maximum by 2.
War
5+ Piety. You can cast Spiritual Weapon without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest.
10+ Piety. You can cast Crusader's Mantle without expending a spell slot. Once you do so, you cannot do so again until you finish a long rest.
20+ Piety. You can cast Stoneskin without expending a spell slot or requiring material components. Once you do so, you cannot do so again until you finish a long rest.
30+ Piety. Increase your Constitution or piety score and its maximum by 2.
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