500
"Because you've slain so many people, you've taken life for granted, even your own. That's what allows the manslayer's heart, which lies deep within your true heart, to take over your soul. Even if you use the power of that manslayer for a self-sacrificing purpose, such as to protect those you love or the weak, it's simply one tiny pebble in the never-ending river of time."
Who is Saijiro from Rurouni Kenshin?