NA Localization:
I wanted power.
I wanted proof of strength.
I wanted honor.
I wanted a warrior's pride.
I wanted it all, and I ended up hurting others and doing many disgraceful things.
...Because of that, I wasn't able to obtain the chakram. Funny, since it was a weapon that I could easily get a hold of just by stretching my arms out during my past life.
I want power.
I want power to protect you.
Protect, protect, and keep on protecting...and if I ever die in battle, I probably won't regret it.
But then the moment I made that vow, surprisingly, this weapon of mine suddenly felt right within my grasp.
My pride is infused into this weapon.
And what I should protect is now on my back.
Fan Translation:
I have always desired for strength.
I have always wanted the proof of strength.
I have always longed for honour.
I have always wanted the pride of my status as a warrior.
In order to obtain everything, I have hurt others, and I have also acted very disgracefully
As well as conducting very horrendous acts.
......As a result, I was unable to obtain this chakram.
During the time when I was alive, I could only reach my arms out towards this weapon.
I still desire strength.
I still desire the strength to protect you.
I will protect, protect, and continue to protect―――until the day I die in battle.
And even if I die in this manner, I would never regret it.
So, as I pledge,
and strangely, due to that oath, I have finally got used to this weapon of mine.
This weapon has became my pride.
What I should protect is now on my back.
And that is Aśvatthāman:in its entirety.