Kronos - Notices and controls Percy's dream

Peace, little servant. Our six months have bought us much. Zeus’s anger has grown. Poseidon has played his most desperate card. Now we shall use it against him. Shortly you shall have the reward you wish, and your revenge. As soon as both items are delivered into my hands … but wait. He is here.
What? The invisible servant suddenly sounded tense. You summoned him, my lord?
No. The full force of the monsters attention was now pouring over me, freezing me in place. Blast his father’s blood-he is too changeable, too unpredictable. The boy brought himself hither.
Impossible! the servant cried.
For a weakling such as you, perhaps, the voice snarled. Then its cold power turned back on me. So … you wish to dream of your quest, young half-blood? Then I will oblige.
The scene changed.
I was standing in a vast throne room with black marble walls and bronze floors. The empty, horrid throne was made from human bones fused together. Standing at the foot of the dais was my mother, frozen in shimmering golden light, her arms outstretched.
I tried to step toward her, but my legs wouldn’t move. I reached for her, only to realize that my hands were withering to bones. Grinning skeletons in Greek armor crowded around me, draping me with silk robes, wreathing my head with laurels that smoked with Chimera poison, burning into my scalp.
The evil voice began to laugh. Hail, the conquering hero!
I woke with a start.

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The Lightning Thief, Chapter 16