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Buck’s curse is dispelled
By fulfilling the terms of a Geas. 
A geis can be compared with a curse or, paradoxically, a gift. If someone under a geis violates the associated taboo, the infractor will suffer dishonour or even death. On the other hand, the observing of one's geasa is believed to bring power and good fortune. Often it is women who place geasa upon men. In some cases the woman turns out to be goddess or other sovereignty figure. 
The geis is often a key device in hero tales, such as that of Cúchulainn in Irish mythology. Traditionally, the doom of the hero comes about due to their violation of their geis, either by accident, or by having multiple geasa and then being placed in a position where they have no option but to violate one geis in order to maintain another
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