Musical SpellFuel

By sacrificing your use of a spell, you're able to extend the use of your Bardic Performance.

Prerequisite(s): 1st-level Bard

Benefit: You may sacrifice any number of spells at any time to increase the number of rounds that you're able to use your Bardic Performance for the day. This increase is equal to one half of the spell level that you sacrificed (rounded down).