"I've written a ballad for your funeral. Would you like to hear the chorus?"
Level 3
Dance of Blades.
Action: Expend one use of Songweaver's Inspiration and roll your Vicious Mockery damage. Add the value to your next attack or defense roll.
Level 7
Harmony of Blades (1/round).
When an enemy misses an attack against you, you may expend a use of Songweaver's Inspiration to make an attack against them for free.
Level 11
Song of Blades (1/round).
When you use your Songweaver's Inspiration to grant an ally a reroll, you may add the value of their rerolled die to your next attack roll.
Level 15
Chorus of Blades (1/encounter).
Action: Expend one use of Songweaver's Inspiration. Until the end of your next turn, allies who can see you have Advantage on their attack rolls, and enemies have Disadvantage on theirs.