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Children's / YA book, don't remember too much about it. Main character is a wizard/apprentice? Prophecy of imminent destruction, quest to prevent it. Other fantasy races: trolls, living in underground caverns. Danger turns out to be alien spaceship which begins to harvest world for resources, by building a series of signal fires manage to communicate the presence of intelligent life.

Teranon adds: The dragon(s?) in the story spoke with certain parts of the sentences replaced with synonyms with slashes (for example: great/wonderful/fantastic). Also the main characters were a father son team, with the son apprenticed to the wizard father. I also think they made the signals in geometric shapes (circle, triangle, etc).

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Not that I know anything about the story, but does it mean the alien are actually benevolent? I mean they accidentally mine the world thinking it doesn't has any intelligent live and they stop when they get the message from the heroes? –  Martheen Nov 23 '12 at 10:50
    
Yes, I don't actually remember if there was much detail given about the aliens, may have actually been an AI mining ship - anyway they stopped/left once the heroes got their attention, I think perhaps they used the lights to signal some sort of mathematical pattern? –  UnbanRonMaimon Nov 23 '12 at 15:43
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