Incantation Master

Spellcasting or Pact Magic feature, the ability to cast 3rd-level spells

Your skill with one signature metamagic incantation is unparalleled. Choose one metamagic incantations from your high magic sourcebook. You always have this incantation prepared and can cast it during a high magic induction without the material requirement of a high magic sourcebook. This incantation doesn’t count toward the normal limit for incantations.   Additionally, you can use this incantation on a spell you cast outside of a high magic induction. Once you use this feature, you can’t do so again until you finish a short or long rest.