witch ability

[Shinigami21XX]

I remember reading about an ability that a witch could use that did something like kill the crops of a plot of land by pacing around it, and i've made a campaign were it is a crucial ability, but now that i'm making the character, i cant find it anywere or in any of the books.
i thought it was a grand hex but i've checked all the books and can't find it.
were is it or did i imagine it, or is it for some other class?

[Zhayne]

Is it for an NPC? If so, you can just give him/her the ability to do so, as it's part of the plot.

[Damon Griffin]

The hex is called blight. It's not a grand hex.

[Shinigami21XX]

thanks