lirael enter death

Apparently she should feel Death and then sort of reach out to it. It was easier in places where lots of people had died, or were buried, but theoretically it was possible anywhere.
Lirael closed her eyes to concentrate harder, furrows forming across her forehead. She could feel Death now, like a cold pressure against her face. She pushed against it, feeling its chill sink into her cheekbones and lips [...]
She opened her eyes. A river flowed against her legs, but it was not the Ratterlin. It was black and opaque, and there was no sign of the island, the blue sky, or the sun. The light was grey, grey and dull as far as she could see, out to a totally flat horizon.
Lirael shuddered, not just from the cold, for she had successfully entered Death.

Lirael, Ch. 35, pg. 354-355