Oh yeah, the reason I said Alice + Loki is because Alice has Repel Dark (will cover Siegfried's weakness as well as give him dual instant death immunity) and Loki has Apt Pupil (doubles crit rate, very nice with a skill like Vorpal Blade, even better if you can get Pralaya on him somehow). --- Rend... slaughter... devour your enemies! There is no other way to survive. You cannot escape your hunger, Warriors of Purgatory.
Lessee, Brave Zapper/Brave Blade comes from Susa-no-o, Thanatos, Lucifer, and Atavaka... Auto-Mataru can be pulled from Thor, Melchizedek, and Metatron...
Alright, I got a okay one for you;
(Rangda or Surt) (Magician 40 and 52 respectively) x Suzaku (Temperance 51) x Thor (Chariot 53) = Loki (Fool 58), if Thor has the highest current level You want to pass on Thor's Auto-Mataru along with elements from the Magician and Suzaku(Siegfried's Slash inheritance does not allow elements to be inherited)
Now make a Thanatos (Death 64); try to pass on Repel Dark from Alice and as many Dark skills (mudo, Die for Me!) as you can (Slash inheritance can't inherit Dark skills either)
Then Loki x Thanatos = Siegfried (Strength 59). This way you can shoot for inheriting Auto-Mataru, Apt Pupil, Brave Zapper, and Repel Dark at once.
Brave Blade isn't that great though. Not as good as Vorpal Blade anyway. --- Rend... slaughter... devour your enemies! There is no other way to survive. You cannot escape your hunger, Warriors of Purgatory.