Allods Online Forum

actually the more rubies you have the more max stacks you can get,it's not like with mages and that electrtic buff that the more rubies you have the more stacks you get per attack
with 1 ruby max 3 stacks
with 2 rubies max 6
with all max9

Quoted from "skullskaldy"

actually the more rubies you have the more max stacks you can get,it's not like with mages and that electrtic buff that the more rubies you have the more stacks you get per attack
with 1 ruby max 3 stacks
with 2 rubies max 6
with all max9

(S)He's not talking about Unison,but about Grand Finale itself.
Grand Finale's rubies don't give you 1 more attack per ruby,but they add 1 attack(r1) and then they raise that final attack's damage(r2,r3).
So it's not a bug,it just works like that lol,since there's written:"Your successful Dancing Blade and Raving Blade spell casts ONE additional attack for X to Y physical damage",where X&Y depend on your gear and the rank of the skill.

Quoted from "AleXutZa"

well all damages looks the same in the rubies so i dont understand what is majoring just changed my build and i added r1 grand finaly and hits the same absolutely the same so i now have 2 more rubies yeee

Sometimes grand finale hits after a delay so you might not notice its damage and also as AllMightyW said all the 3 rubies increase your raving blade ticks by only 1 tick and that additional tick hits harder per extra rank of grand finale ruby..Also you might notice the difference in its damage per rank if you use a weapon that hits harder physical damage (axe or mace) and not spear and sword so you can feel its damage better..TBH these aren't a priority rubies to max for me unless I have all I need as you'll always have to cast all of raving blade to hit grand finale.Well if you happen to change your build again, you can check grand finale's damage in rank 1 and rank 2 on training dummy near arena with your cantata off if you wanna calculate the damage exactly.