This has been both a strong monster boss and a strong summoned monster. Its physical characteristics consist of little else but a large gaping mouth or portal which sucks the enemy in and does gravity-based damage (based on the enemy's HP).

	FF1 (Dawn of Souls) (ENEMY) -Atomos ATK: Worm Hole
	FF5 -Atomos (ENEMY) ATK: Worm Hole
	FF9 (SUMMON) -Atomos ATK: G-Force 199
	FF12 (ENEMY) -Atomos (mark) Although it doesn't look anything like the previous versions, there is a mark called Atomos. CP: Being a mutant Slaven, its body encrusted with all Manner of precious Crystals. With the passing of Months and Years, the Impurities in these Crystals are gradually absorbed by the Creature, purpling their natural Ochre Hue to beautiful Effect. These Crystals are traded for a high Price, making their Bearers the Target of much Over-hunting by Soldiers tasked with acquiring Funds for Archadia's War Effort. So have these Slaven learned to fear and attack Men, and for this Reason was a Bill for this Mark posted.
	Unlimited (SUMMON) -Atomos SOIL: Storm Blue + Acid Gray + Silent Black

Other Appearances

FF12 In FF12, there's also a ship model called the Atomos; Balthier gets the party out of the Leviathan on one.