From Game of Thrones:

The godswood was empty, as it always was here in this citadel of the southron gods. Ned's leg was screaming as they lowered him to the grass beside the heart tree. "Thank you." He drew apaper from his sleeve, sealed with the sigil of his House.

"Kindly deliver this at once."

Tomard looked at the name Ned had written on the paper and licked his lips anxiously. "My lord..."

"Do as I bid you, Tom," Ned said.

How long he waited in the quiet of the godswood, he could not say. It was peaceful here. The thick walls shut out the clamor of the castle, and he could hear birds singing, the murmur of crickets, leaves rustling in a gentle wind. The heart tree was an oak, brown and faceless, yet Ned Stark still felt the presence of his gods.

There was something strange building up in the air like a thrum of power.

Suddenly two cuts appeared in the heart tree and blood began gushing forth. Ned noticed that they resembled eyes.

From Deathly Hallows

"Avada Kedavra!" "Expelliarmus!" The bang was like a cannon blast, and the golden flames that erupted between them, at the dead center of the circle they had been treading, marked the point where the spells collided. Harry saw Voldemort's green jet meet his own spell, saw the Elder Wand fly high, dark against the sunrise, spinning across the enchanted ceiling like the head of Nagini, spinning through the air toward the master it would not kill, who had come to take full possession of it at last. And Harry, with the unerring skill of a Seeker, caught the wand in his free hand as Voldemort fell backward, arms splayed

Ned saw all this and other images a cup, a locket, a diadem, a snake, a diary, all destroyed.

Lord Voldemort died, truly this time.

He had no Horcruxes left to save him so he fell.

He saw a stream of fire below through the air around him, then he saw a wave a frost crash into it. The two forces seemed to be clashing, and Voldemort could see images in them.

In the fire he saw strange priests playing with fire, he saw large dragons take flight and burn civilizations, In the ice he saw Inferi and strange creatures with blue eyes and pale skin.

Voldemort tumbled downward and then opened his eyes.

He found himself in a stranger's body.

He was staring at a tree that had two cuts in it resembling eyes with a red liquid resembling blood flowing from them.

Even though he lacked his wand he could still the powerful thrum of magic in the air, and he could feel it calling to him.

Voldemort channeled the magic through his new body, and he could feel the clash of fire and ice ringing through his body.

Then he collapsed.

Ned awoke with his head ringing as though he had drunk too much wine.

The ground around was scorched and he could see hints of frostbite on his arms.

At that moment, Cersei entered the godswood.

She looked at the area around Ned in shock. "What is this..." she asked.

Ned grit his teeth and forced down the urge to vomit.

"Not now..." he said "I know the secret for which Jon Arryn was killed"

A voice in his head began to laugh, "It seems I have possessed the body of a fool"