I’ve recently updated my stance on this as within the Nordic practice there is no duality. What do I mean by duality? The monotheism of the worlds spirituality puts things as Good v Evil, Black v White, Light v Dark however in the Norse practice it is simply Order v Chaos.
This puts baneful casting in a totally different category, instead of intent you’re now in the energy area. So how does it work? Well it was illustrated like this:
Order - Aesir (gods) everything is well thought out, organised, all possible outcomes prepared and directed, then release the spell. 

Chaos - Jotun/Vanir (giants/nature spirit) it’s emotional, haphazard, reactional, consequences are not always considered, outcome is non directional, then release the spell and

So it looks like this.
Order, is like a witch praying to say Odin and seeking his assistance, you hit the books, get the ingredients, put it all together, know where, what, why, how, who and when.
Chaos, is standing on a beach, invoking the giants then wondering why a tsunami has just drowned your opponent but drowned you too.
So how do Nordic witches use baneful magic, well we do, but instead of Good v Evil we invoke Order over the Chaos, so for example when invoking Loki (chaos and trickster, love him but highly unpredictable
), you would also invoke Thor (order in nature) and whilst drawing in the natural energies of the earth -
(which is both Order/Aesir (Frigg) and Chaos/Jotun (Bestla Odin’s mother) mother earth can heal on a summer’s day, and kill you with a volcano)
to cast your curse/hex Thor’s energy will ensure Loki’s energy is contained and directed with minimal backlash.
Something to remember within the Norse practice are those wonderful Norns and the web of wyrd, if we cast in a state of bad intentions, those lovely Norns may rewrite our wryd (our story). The other consideration is Yggdrasil and the pool of tears. Everyone’s life, memory and stories go into that tree and become part of its energy. If we as humans are pouring into that well revenge, pain, suffering and hate we are contributing to an ongoing outpouring of that energy into the world - do we want a world like that?
Just some thoughts to ponder this from a different spiritual angle, which is not quite the Wiccan Rede but gives the practioner things to deeply think over in any type of spellcasting. I know Loki is my patron but as someone who’s worked with chaos and trickster/Jotun energy I would think very carefully before invoking Loki (or any chaos energy) in a baneful working even with Thor as a shield - afterall how do you control a tsunami.
Skal
