The Emberstone's restrictions have changed:
The stone can only imbue life to organic material or sentio metallico. The life created is only semi-sentient and isn't too terribly intelligent, however, and will become inanimate once more after some time.
To revive a dead person, you must have the body of the deceased in question, or at least a significant portion of the corpse. Resurrections are permanent, however under most circumstances the revived must remain in somewhat-close proximity to the Emberstone, lest they gradually lose "energy" and die again.
This new power can be accessed once the Emberstone is fully purified. It still retains some measure of corruption from the events on Spirabilis.