User blog comment:Jaymixvp/I need help finding the name of this certain instrumental in fairy tail../@comment-7418318-20130430133458

If you mean the music that plays while Hades is shooting Natsu, after commenting about Makarov exposing Fairy Tail to too much sunlight:

It sounds like the beginning of "OST 1: Track 34 - Guren no Ikari (The Anger of the Crimson Lotus)" to me.