You momentarily stop time around yourself. Everyone else can perceive you, but a localized temporal stop locks everything in place. No counterspell can stop this spell once you strike the first chord. The souls of every bard who came before join you in a ghostly symphony as you play the greatest - and final - performance of your life. When you strike the last, cataclysmic, reality-tearing chord, it collapses your own biological engine into a massive, star-tossed supernova of localized gravitational destruction. Your body dissolves into beautiful violet stardust as you unleash the ultimate performance. Every hostile creature within a 120-foot sphere centered on you must make a Constitution saving throw at Disadvantage against your spell save DC. A target takes 20d10 force damage and 20d10 thunder damage on a failed save, or half as much on a success. This spell completely bypasses active Antimagic Fields, Dead Magic Zones, and, again, cannot be intercepted by Counterspell.
Simultaneously, every friendly creature within the sphere is instantly restored to its maximum hit point value, is completely cured of all negative conditions, levels of exhaustion, or curses, and gains the benefits of a full Bardic Inspiration die that lasts for the next 24 hours. Your soul becomes permanently anchored as a guiding light along the twilight horizon, while your magically silenced musical instrument remains in the space where your body vacated, a final testament to your majesty.
* - (A masterwork musical instrument, of Rare (Blue) Quality or Higher, which will consume the magical power of the caster and be rendered silent and incapable of being played by anyone for the rest of time, remaining as a silent testament of the apocryphal power and artistry that went into the spell.)
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