Vulcan is collecting flames in the lower level of the Forge of the Gods. He'll give you a special reward if you defeat all the monsters there and bring him the flames that you collect.
Klein says you must have a set of floating stones to enter the Flame Pass. You can create the set of floating stones with vacualite. Speak with Blacksmith Hilda in the Town of Goddard to obtain vacualite.
Obtain the Ore
Target: Garden of Beasts
To smelt Vacualite you need 50 pieces of Vacualite Ore. It can be obtained in the Garden of Beasts.
You've collected the Vacualite ore you need. Return to Blacksmith Hilda in the Town of Goddard.
Return to Klein
Target: Valakas Watchman Klein
You've got the vacualite. Return to Klein at the Forge of the Gods.
Get the Vacualite
Target: Blacksmith Hilda
Klein says you must have a set of floating stones to enter the Flame Pass. You can create the set of floating stones with vacualite. Speak with Blacksmith Hilda in the Town of Goddard to obtain vacualite.
Obtain the Ore
Target: Garden of Beasts
You need Vacualite ore to make Vacualite. Hunt monsters in the Garden of Beasts and collect 50 Vacualite ore. Monsters to be hunted - Kookaburras, Bandersnatch and Grendels
Return to Blacksmith Hilda
Target: Blacksmith Hilda
You've collected the Vacualite ore you need. Return to Blacksmith Hilda in the Town of Goddard.
Return to Klein
Target: Valakas Watchman Klein
You've got the vacualite. Return to Klein at the Forge of the Gods.
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Quest walkthrough
Route map from the entrance to Klein
The quest is taken inside Forge of the Gods from Klein. On the way to him there'll be lots of high-level aggressive mobs, so it's best to go there under the Shadow Move dance from Bladedancer or the similar Silent Move of daggers.
After you've taken the quest, use SoE to Town of Goddard. Go to the forge and talk to Hilda.