Divine Intervention

When the spell is cast, you turn into a divine beast either physical or ghost-like, invisible to people but powerful. You can either gain three magical powers of your choice, including

• 1,500 projectable feathers that turn into powerful blades unable to be destroyed.  If the target fails a mass dexterity saving throw, they take 5d20 damage each. If they succeed, they take half that damage
• The roar of a lion capable of petrifying 5d20 mortals of CR 15 or less
• Unmeltable ice capable of paralyzing an enemy. This cannot be removed unless short of a Wish spell.

Or, you can take on a ghost-like form and do any of the following:

• You afflict an enemy with an incurable plague. They take 1d10 damage on each of their turns until a long rest. This can be cured with a Wish spell.
• Bring your party back to full XP
• Create any kind of natural disaster or obstacle for the BBEG

After the spell is complete, you revert to your original form and must take a short rest before casting another spell.