User blog comment:Linathan/Unit Spotlight: Slayer Grandt/@comment-26258826-20150522214427/@comment-26140304-20150522222322

If you use him as a Leader in his 7* form, you'll see a huge difference in damage. If you have a crit buffer, you'll land crits a lot easier, which will drastically increase your damage output.

Also, the Fire Mecha God dungeon is really easy to clear. You can grab a 7* Selena friend and solo the boss. :)