Golden Dust!

'Clank! Clank!'

She instantly looked up in the direction of the lake. There was barely any mercury left anymore and most of the part of that hill was visible now.

'What is it! A hill covered with mercury? A treasure island?'

Her trail of thoughts was disrupted by the bubbles that formed all over the lake of mercury. 

The earth beneath the lake shook and the ground under her feet too. The earth began to rise — or the water began to evaporate, she didn't know. One thing he knew, it was coming. The black hill was trembling too.

The quake stopped and out of the lake came a beautiful bluish-black and huge giant serpent that was covered with silvery liquids, shining like a metal sculpture. The serpent had an enormous body with two front claws and two strong hind legs with the tail of a dragon and black, creepy wings. Those two wings were tied with two metal chains, maybe to stop them from flying.