Quasar (ability)

Quasar is a type of Blue Magic that deals non-elemental, unblockable, sometimes defense ignoring damage. It's usually obtained from powerful enemies or bosses.

Final Fantasy VI
Strago can learn Quasar from Goddess or Doom. A more powerful version called Grand Train (Grand Delta in the GBA remake) can be learned from Hidon.

Final Fantasy VII
Pandora's Box is an enemy skill that can be learned on from the Zombie Dragon in the Northern Crater on disc 3.

Final Fantasy VIII
Shockwave Pulsar is Quistis's ultimate Blue Magic spell. It's the only ability, if she's powerful enough, other than Eden to break the 9999 damage limit.

Final Fantasy X
Nova is a Ronso Rage that Kimahri Ronso can learn.

Final Fantasy X-2
SuperNova is a more powerful ability than Nova that Gun Mages can learn.