
The knights themselves each attack with different weapons and spells (according to Ultimania Omega).
* The first knight attacks with a long sword that looks like Cloud's Rune Blade,
* The second knight attacks with a lance,
* The third knight attacks with a rod and casts what looks like fire magic,
* The fourth knight attacks with a mace,
* The fifth knight attacks with a long sword,
* The sixth knight attacks with a hammer,
* The seventh knight attacks with a wand and casts what looks like blizzard magic,
* The eighth knight attacks with a trident,
* The ninth knight attacks with a staff and casts Comet on the target,
* The tenth knight attacks with a naginata,
* The eleventh knight attacks with a battle axe,
* The twelfth knight attacks with a sword,
* And the thirteenth knight attacks with Excalibur.
Knights of the Round costs 250 MP to cast. Knights of the Round is a series of 13 individual attacks hitting all enemies with piercing damage each time. At its maximum, Knights of Round can do up to 129,987 damage to a single target. It takes one use of Knights of the Round to destroy most enemies. The only exceptions are the WEAPONs Emerald and Ruby and Safer∙Sephiroth, but if the party is sufficiently leveled, it takes at least two uses to defeat Sephiroth, and many successive casts to defeat the WEAPONs. However, it is ill-advised to cast it on Ruby WEAPON, as it will counter with the most powerful spell in the game, Ultima. However, combining it with Hades in a W-Summon negates the risk, as Ruby WEAPON will be paralyzed. Alternatively, it can be linked to an HP Absorb materia, which will make sure that the caster has 9999 HP and will be able to survive Ultima. Knights of the Round will not work with Quadra Magic, whether it is linked to the specific Knights of the Round materia or to the Master Summon materia.
and the competitor... EDEN! from FF8
(image was too big but here is a link)
Eden is the only GF that can do more than 9,999 points of damage, even without the Boost ability learned. With all GF abilities learned (including the Boost ability), the player can easily boost the attack to a full 250 considering it also has the longest animation in the game. This allows the player to inflict at least 20,000 points of damage to all enemies, even more if Eden is at higher EXP levels. At the absolute maximum of its power, it can deal 60,000 Damage to all enemies, which is the highest amount of damage that a single attack can possibly do (Barring Limit Breaks).
So who is the best?