Divine Calling

Description:

In a world where the gods have become silent to most,  you remain loyal to a vanished god. Once per combat, you may attempt a Divine Calling, reaching beyond the veil for divine empowerment.

Mechanic:
Roll 1d20 + your Charisma modifier. Each time you succeed, the DC increases as follows:

• Success: Add your Charisma modifier to your all attack rolls.
  If your attack total exceeds 20, you deal double damage on that attack.

• Failure: You suffer disadvantage on all attack rolls until your next short or long rest.

The DC does not reset between combats. The effects—boon or bane—last until your next rest.