La luce fantastica - The Light Fantastic, by Terry Pratchett (1986, UK)

Here we are again: Rincewind is about to fall off from the Discworld with Twoflowers. But someway they end up to be in a forest where trees talk to them (although Rincewind decides that, since they can't talk at all, he's not going to talk with them). A new adventure, despite Rincewind: Cohen the warrior (now in his 80s), druids on rock clouds, the Unseen University, Bethan, the Magic Shop, the red star coming closer, the Magic Book and many other things. Simply great.