Blast the Gateway

Magistrix Seyla is located at 58,18.

She gives you the item called Sizzling Embers, right click it to summon the quest pet. Then go kill the Fel Sparks in the surrounding area and as you do, the quest pet will continue to grow larger.

Eventually the pet will turn into am Unstable Fel Spark which is the same color as the Fel Sparks. When you reach this point, go and stand in the gateway new Magistrix Seyla and the pet will slowly move to the gateway and blow up which will complete the quest.

Some quick things to note about this quest:

• 
  
• To complete the quest, you need to take the Unstable Living Flare to the gate at 58,18, where you got teleported as part of the initial quest The Missing Magistrix (http://www.wowhead.com/?quest=11526).
• 
  
• It takes about eight kills of Incandescent Fel Sparks for the Living Flare (http://www.wowhead.com/?npc=24916) to be fully charged to its Unstable Living Flare (http://www.wowhead.com/?npc=24958) state.
• 
  
• You do not need to land the killing blow, nor have tagged the Fel Spark to get the kill to register on your flare. You just need to be within ten yards or so.
• 
  
• The flare will not despawn if you mount on either a land or flying mount. You also do not need to dismount for the flare to trigger the explosion at the gate.
• 
  
• The flare will despawn and lose all charges when you get killed and you will need to start again.
• 
  
• The flare will also despawn and lose all charges if you summon a different minipet or one of the JCing trinket pets. My shaman uses Nightseye Panther, and the little panther it summons when I use the trinket was causing the pet to despawn.
• 
  

Please note that you don't need to have the kill count on those mob, standing near a dying Fel-spark is sufficient to growth your Living flare