Medb is a multi-faceted figure of Irish lore, linked with priestess work in the Otherworld, the sovereignty of Ireland itself as a goddess, and the rites of judgement and right rule. The Banshenchus (the Lore of Woman) manuscript, may have described her best; "Glorious, perverse, extravagant and liberal".
Goibhniu's story is one of the power of creation; for in the act of crafting an item is the intimate knowledge of that item, as it comes into being with your own hand. When one possesses complete and intimate knowledge of a thing, then there is no mystery to it... and in a way, no harm that can come from it.