Damage of final strike is 40 per strenght and 80% of hp + hydras (thats what it said on the page u linked)
If you have 120 strength and 20k hp and 4 hydra it is :
(4*0.2)*(120*4 +0.8* 20 000)+(120*4 +0.8* 20 000)
0.8*(480+16 000)+(480+16 000)
13184 +16 000
29 184 damage (double with lex)
final strike is affected by target defense, unlike asura.
If target has 40 def + some vit def and angelus + assumptio + thara + raydric ur final strike damage = crap
I tested ninja on another server and it is pure crap.
Ninja is either like a crapy hunter with kunai.
A crapy wizard with crapy spells.(storm gust own all of ninjas spells)
A crapy copy of asura monk with suicide-self-bonus.
A dodger that get pwned by any character with fast attack speed.
The only thing good about ninja is the area water spell that the wizard can use to cast water ball.
I am sorry but if u plan killin with a ninja during the tournement I suggest to not lose 1 year of hardcore lvling on a 1/1/1 server for that.
p.s. If you don't beleive for the 999 999 asura maybe me and Ehaltar could do you a little demonstration in-game?(who are ur char in-game?)