Consecration

You call upon Holy power to purify a radius with radiant energy. 

You create a 15ft Radius around you. Any undead or fiend that enters the area for the first time, or starts its turn in the area, must make a Wisdom Saving Throw. On a failed save, the creature cannot enter the consecrated space.

At 5th level, this radius also deals 1d4 radiant damage every turn an undead or fiend spends in this consecrated space.

At 7th level, spells cast from a consecrated space by Clerics or Paladins who champion the God that consecrated this space, deal an additional 1d4 radiant damage.

At 9th level, the radius now deals 1d6 radiant damage every turn.

At 11th level, spells cast from this space now deal 1d6 additional radiant damage.

At 17th level, the holy power called upon by a greater cleric or paladin can powerfully weaken undead or fiends. Should an undead or fiend be within 20ft of this space they must make a constitution saving throw or suffer the Poisoned condition from the emanating radiant energy. Should this creature spend several turns in this space they will suffer increasing levels of  exhaustion (starting on round 3) in this consecrated space.

*Note, Consecrated spaces can be defiled by contesting desecrating energy if the Cleric / Paladin fails to continue maintaining holy energy