Duomancy: Two-Caster Magic (5e)
"Duomancy" is a new system of spells for your campaigns¸ allowing two casters of any class or discipline to combine their magical energies and more potent and unusual spells than ever before. This title includes rules for casting spells with two spellcasters¸ as well as 29 unique "dual spells"--spells that can only be cast through the art of duomancy.