After getting Glycinia, go to Gracula. There will be a gremlin named Lubinnia, equipped with a Sherwood Bow. Have Glycinia go next to this gremlin. It is Lubina in disguise. If both fairies are next to each other, and neither has moved this turn, they can combine their powers to cast Magic Barrage, which costs half their HP, and does great damage for fairies. It also vanquishes undead.