Lux Alibi 1 of 3 - The evil wins, but...

It's a sunny Sunday, and Mauro is climbing with his friends on the Lepini mountains, close to Rome, when he finds a strange crystal ...A strange crystal that gets him in the middle of a battle between a wizard and some forest warriors!
Mauro has found the unique Moon-Crystal: an item able to release unbelievable magic-powers on the full moon night.
And now the evil warlock Nefeg is leaving with it: the forest warriors have lost their battle!
In 14 days is full moon: then Nefeg will destroy the Forest People, their lands ...and Mauro with them!