"Billowing ghosts of light swarmed the chamber, fleeting unnatural forms that defied description and which lingered uncomfortably in the darkest reaches of her imagination. Clouds of feelings filled the chamber: thunderheads of anger, zephyrs of regret, hailstorms of longing, hurricanes of love and betrayal. Emotions and meaning surrounded her, though how such concepts could be given physical, visible form was a mystery to her. Dalia took a step into the chamber, feeling her will erode in the face of the primal energies that surrounded her and infused her at the same time."-Mechanicum
"Yet all this splendour, of a scale greater even than the galaxy it enshrouded, was non-physical. Its substance was that of thought, emotion, intention, disembodied consciousness. The bodies of its creatures, their towering palaces, the paradises, the purgatories, the places of abomination, were only apparent. In truth nothing was there but psychic force."-Eye of Terror
Daemons are psychic energy and also have similar mentions in codexes, sadly I don't have them on my cell phone.