Blood Transcription

By consuming 1 pint of blood from a spellcaster killed within the last 24 hours, you can attempt to learn a spell that spellcaster knew. Select one spell available to the dead spellcaster (this must be a spell on your spell list); you gain the knowledge of this spell for 24 hours. During this time, you may write it down using the normal rules for copying a spell from another source. Once you have learned it, you may prepare the spell normally.

Sorcerers using this spell may replace one of their spells known if they choose to during a long rest.