User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-28209103-20170330070649/@comment-4802891-20170330080127

Sounds like the Sicarii Zealots. In that case, his second skill could be "the 13th Attribute of Mercy", which is pardon. Silver is also a sacred medal in Judaism, the lesser holy metal, used for ceremonial relics.

Since you took quite a lot of liberties on this one, I'm not even sure if I'm going on a slide into spikes again or not, but the number 30, associated to silver, suicide and a power to bring chaos to the world... makes me think of Judas Iscariot (who wasn't a Sicarii historically), or maybe Menahem ben Yehuda (if your liberties go as far as making him the immortal Judas doing stuff before going to the Far Side).