hi can anyone give me some tips on the black elemental at via infinito
i cant beat it im level 53 2 dark knights and 1 gunner

Try using magic defence stuff. Like shell (obviously). And use darkness or spare gil.
And if your songstress knows Magical Masque. You can avoid Ultima. Good Luck

Actually, Spare Gil is the easiest and cheapest way to defeat him.

Cat Nip. He only has 9999 HP...