Gigathrow is a boomerang move learnt by holding the "Boomerang bible" item in DQIX. This costs 16 MP, and is the only boomerang move that hits a single enemy only. It does 150-200 Hp damage to enemies, but does not effect metal, gem, or Darkonium slimes. To obtain the book, you need max boomerang skill, and complete quest 85 and 86.