Domain Expansion: Sacred Field of the Potato God

Level: 5th
Casting Time: 1 action
Range: Self (15-foot radius, increases with spell level)
Components: V, S, M (a holy symbol of the Potato God and a small, enchanted potato worth at least 100 GP)
Duration: Concentration, up to 1 minute

Description:

When you cast this spell, you create a field of divine and eldritch energy centered on yourself, filled with the sacred power of the Potato God. The field's effects scale with the level at which it is cast.

At 5th Level (basic effects):

1. Divine Authority:

   • Enemies within the domain have disadvantage on saving throws against your spells and abilities.
   • Allies within the domain have advantage on saving throws.

2. Eldritch Potency:

   • As a bonus action on each of your turns, you can cause an eldritch blast to emanate from the ground, targeting one creature of your choice within the domain. The target must make a Dexterity saving throw. On a failed save, the target takes 2d10 force damage, or half as much damage on a successful save.

3. Sanctified Ground:

   • The ground within the domain becomes sanctified. Creatures of your choice that start their turn within the domain must succeed on a Wisdom saving throw or be charmed or frightened (your choice) by you until the spell ends.

Scaling with Spell Level:

• 6th Level:

  • Radius: 20 feet.
  • Eldritch Potency: Targets up to two creatures. Damage increases to 3d10.
  • Potato God's Blessing: You gain resistance to one damage type of your choice while within the domain.

• 7th Level:

  • Radius: 25 feet.
  • Eldritch Potency: Targets up to three creatures. Damage increases to 4d10.
  • Potato God's Blessing: You gain resistance to two damage types of your choice while within the domain.

• 8th Level:

  • Radius: 30 feet.
  • Eldritch Potency: Targets up to four creatures. Damage increases to 5d10.
  • Potato God's Blessing: You gain resistance to three damage types of your choice while within the domain.
  • Area Control: The domain moves with you, maintaining its radius centered on you.

• 9th Level:

  • Radius: 40 feet.
  • Divine Authority: Allies within the domain gain temporary hit points equal to twice your spellcasting ability modifier at the start of each of their turns.
  • Eldritch Potency: Targets up to six creatures. Damage increases to 7d10.
  • Potato God's Blessing: You gain immunity to one damage type of your choice while within the domain and resistance to all other damage types.
  • Sanctified Ground: Creatures charmed or frightened in this way have disadvantage on attack rolls against you and their movement speed is halved while in the domain.
  • Blessed Intervention: Once per turn, when you take damage from an attack, you can use your reaction to reduce the damage to 0.

Special:

The visual manifestation of the Sacred Field of the Potato God might include glowing vines of potato plants, divine light mingling with eldritch shadows, and the faint aroma of cooked potatoes. The ground within the domain may shimmer with sacred energy, and ethereal potato-like spirits might be seen aiding allies or hindering foes.

In dire circumstances, when the spellcaster is facing imminent death or the total annihilation of their allies, they can force the casting of this spell by invoking the true name of the Potato God and sacrificing a portion of their life force.

1. True Invocation:

   • The spellcaster must call out the true name of the Potato God as a bonus action.
   • This act requires an immediate sacrifice of hit points equal to half of the caster's maximum hit points (rounded up).

2. Life Force Sacrifice:

   • After the spell is cast, in addition to the normal aftermath, the caster gains one level of exhaustion.
   • The caster cannot regain the sacrificed hit points through any means other than a long rest, which only restores half of the sacrificed hit points. A second long rest is needed to restore the remaining sacrificed hit points.

3. Divine Favor:

   • If the spell is cast in this manner, the spell’s duration is extended to 2 minutes, and allies within the domain receive temporary hit points equal to the caster's level at the start of each of their turns, in addition to other effects based on the spell level.

Aftermath:

• Once the spell ends, you are unable to cast spells or cantrips for the next 2 turns as you recover from the immense exertion required to maintain the Sacred Field of the Potato God.