This is the companion quest to "Blood for Blood," and is given by Magistrix Seyla up at the Throne of Kil'Jaeden ("The Missing Magistrix" is a prerequisite). In "Blast the Gateway" you take on a mission to help shut down the Legion Gateway, by means of an interesting quest mechanic.
- Right-click the supplied Sizzling Embers to release a pet Living Flare, which follows you around. Contrary to what WoWWiki says, I find that it will not despawn if you use your flying mount, as long as you don't get too far away from it (so be careful on your epic mounts).
- Find and kill the Incandescent Fel Sparks, which are fire elementals that wander the Throne area. They have a fireball, but like most of the mobs involved in the dailies, they're not hard to kill. Every a Fel Spark is killed with your Living Flare nearby, the Flare energizes. Note that you don't actually have to kill the Spark yourself; if you see some other people killing one, go help, and any flares in the vicinity will get energized.
- Once your Flare accumulates enough energy (it takes
about fiveeight kills), it will become "unstable" and turn green. Take it over to the Legion Gateway, near Magistrix Seyla, and it'll release its fiery power. Done! Talk to the Magistrix for 12g and 250 Shattered Sun rep.