User blog:Fairy Tail Grand Master/What is the hidden blade made of?

I'm sorry if this is a bother but bear with me. Now maybe you have got a post like this before but I wanna make one as well. *Ahem*

Just WHAT IS THE HIDDEN BLADE MADE OF?! Is it made out of titanium or ADAMANTIUM or something? I mean come on, the hidden blade pierces all armour. If you saw the AC:B literal trailer by Tobuscus (which is awesome) the subtitle says "Maybe those guards have good armour"  "No they Don't! Maybe ""they"" do. they.....DON'T!"

Now this got me thinking...how come the hidden blade goes through all armour? I mean the brute is the most heavily armoured unit in the game and the killing animations with the sword/dagger etc. makes sure that Ezio only hits a weak spot in the armour BUT! when you hidden blade stab him or do that combo kill where he does several stabs at the same time to one point in his stomach the brute dies instantly. Practically the only armour the hidden blade had trouble with were Shakulu's armour and Cesare's armour.

I find this pretty weird cause it pretty much destroys the whole point of wearing armour. AC 1 has an excuse cause the toughest armour the enemies wore was chainmail and chainmail is relatively easy to penetrate unlike plated armour. Granted that crossbow bolts can pierce armour (due to the power behind the shot) but it doesn't make sense for the hidden blade to be able to penetrate any armour.

Luckily in AC III there is no real metal armour (since what kind of idiot wears armour in an age of guns and bullets, plus, bullet proof vests weren't invented yet) so we won't experience this abnormility.