Cursing Ritual

A wicket thing is a curse, not necessarily because it is evil or at least malicious in nature because a curse does not have to be.
As a curse is a ritual there is very little that can not be done with it as long as the caster or ritual-coven stays within the casting parameters, understanding of the basic workings of a curse and the key components.

A curses is worked as a longer ritual which is the original form however, there is also a spell form for some of the more comon curses.

Curses can affect anything which has an inherrent magical component.

A curse is dangerous because it produces a semi-sentient, semi-concious convergance of magic to achieve its effects. The of this magical convergance is singular in mind and intention, based on the intent and emotion of the curse-ritual and its participents.
Thus a curse, especially a powerful one is almost uncontrolable on the finer level. One simply can not make sure what the "human-factor" is.