Originally Posted by
KrakHed
Nope. Remember, when Sylvanas first died, she seemed to be going towards the Light.
Sylvanas wasn't going towards the Light. It was a dark place, just like the 2nd time, but pleasant.
And then it went away. It all went away. The coldness, the stench, the searing pain. It was soft and warm and dark and calm and comforting, and Sylvanas permitted herself to sink into the welcoming darkness. At last she could rest, could lay down the arms she had borne for so long in service to her people.
--Rise of the Lich King
Her experience after dying again starts off the same.
Lady Sylvanas Windrunner tumbled in a free fall. Not in the physical sense; her body had been obliterated at the foot of Icecrown Citadel. It was her spirit that tumbled, lost, like a rudderless ship in a storm.
How had she gotten here? She couldn't remember. Had she been killed by Arthas? Had she committed suicide? Had she been sent to judgment by the Val'kyr? Time was meaningless here. Her whole life seemed not a series of events but a single instant, a pinpoint flash of consciousness in an infinite void.
She saw only darkness.
--Edge of Night
Originally Posted by
KrakHed
And wherever Sylvanas went after her second death, when she initially refused the Val'kyr, was some place they couldn't retrieve her from unless they took her place. Which isn't how things normally work. We're given clear descriptions of "infinite darkness" and an "endless void".
It was more that the val'kyr are weaker at necromancy. They were depowered since Arthas died and Bolvar was dormant. It took 1 val'kyr (their leader) to bring Sylvanas back from that place at ICC. It took 3 to bring her back in Silverpine.