Quote from : The Hobbit: An Unexpected Journey Movie

Radagast: The Greenwood is sick, Gandalf. A darkness has fallen over it. Nothing grows anymore, at least nothing good. The air is fouled decay, but worst are the webs.
Gandalf: Webs? What do you mean?
Radagast: Spiders, Gandalf. Giant ones. Some kind of spawn of Ungoliant or I'm not a wizard. I followed their trail, they came from... Dol Guldur.
Gandalf: Dol Guldur? But the old fortress is abandoned.
Radagast: No, Gandalf, 'tis not. A dark power dwells in there. Such as I have never felt before. It is the shadow of an ancient horror. One that can summon the spirits of the dead. I saw him, Gandalf, from out of the darkness. A Necromancer has come!
Necromancer: [whispers in an unknown language]