Anti-Fortress Noble Phantasm: EXCALIBUR!

On your next turn, after using Gather Energy, target the same creature you used as a focus. Make a ranged spell attack on the creature. A bright golden beam of burning magical energy shoots forward from Excalibur, continuing on its path until it has reached the target.

The spell attack range is is extended to 400 ft. x 5 ft. in a straight line. Once cast, this spell attack is unavoidable.

On a hit, the target creature takes [1d100 x (target’s Maximum Hit Points)/100] Radiant Damage rounded down. All other hostile creatures along this spell’s path take half the total damage.

You can reroll your percentage dice once per stack of Divine Energy. Choose the best roll for damage calculation.

This attack consumes all your remaining spell slots and Channel Divinity charges upon use. You must have at least one spell slot or one Channel Divinity charge to use this Noble Phantasm. You cannot regain any spell slots for 24 in-game hours. Additonally, you become exhausted.