There is an article about the Spell of Shattered Sight with a small interview with Liz. This is what she said:
‘Once Upon a Time’: How will the Spell of Shattered Sight affect Storybrooke?
At the close of the last Once Upon a Time, the Snow Queen (Elizabeth Mitchell) released the dreaded Spell of Shattered Sight, which will cause the town’s residents to turn on one another as they can only see the most ugly aspects of themselves and others around them. Sound familiar? That’s because the spell is adapted directly from “The Snow Queen,” the Hans Christian Anderson fairy tale that Frozen is based on.
“It’s a big spell,” Mitchell tells EW from the Vancouver set of the ABC fairy tale drama, where just outside her character’s ice cream parlor, the Seven Dwarves are at each other’s throats as the spell takes hold. “What’s powerful about it is that it’s such deep magic. It doesn’t just affect one person, it affects everybody that it touches.”
What’s more terrifying is that the town may not realize how powerful this spell really is. “It not only causes pain, but it causes death to everybody except for the people that she’s chosen,” Mitchell reveals.
4x09 Fall - Elizabeth Mitchell - Interview - Once Upon A Time - Snow Queen - Spoilers