so @foodsies4me mentioned wanting more headcanons
and there's this combination of things that have gotten all tangled up in my head that were supposed to be a fic, but I haven't written enough at a time to be able to remotely untangle the strings into a story and it's just so much nonsene but it's emotional nonsense, yk?
it's about runes and magical bonds and virgin shadowhunter energy as an aspect of same, about how white isn't just for mourning, because the Iron Sisters wear it too, Angels bear it, white is untouchable, like grief, but not just grief
What does that mean for Alec and Lydia, who both wore white to their unfinished wedding? what did the Clave make of that, watching them both declare themselves untouchable even as they walked toward each other? (was that why it wasn't just Alec who was relieved when neither of them could go through with it?)
Nephilim get their first rune, graduate from children to Shadowhunters, at approximately what, ten? There's a lot to unpack there, about child soldiers and martial societies and family bonds that are inherently also about the chain of command...
But there are also questions there about how angel blood and runes and human bodies work (or don't work?) all together. They are born with angelic grace, but they can't wear runes immediately.
Nephilim are never just human, but they're hidden away in Institutes and Alicante as children, hidden away until they're runed, until they're protected.
Until they're controlled?
Runes as bonds, to Raziel and Alicante and duty. The first rune, your enkeli or voyance bonds you to the Shadow World, to Shadowhunter duty, to seeing everything that's really there, whether you want to or not.
Seelies can't lie, and the Devil can't betray a contract (just manipulate the fine print before you sign), and Nephilim runes are bonds, are promises, and their vows are unbreakable.
What does that mean for Clary, who wasn't runed until she was an adult, who has more power thanks to Ithuriel's blood and is yet less bound than any other Nephilim on Earth?
Angels are about devotion to their duty, (messengers of God), Fallen Angels broke that bond (refused to pass along the message); Nephilim are devoted to their Covenant, their fight against Demons, their very blood that makes them Angelic.
Nephilim are only human, and can only endure and uphold so much devotion, can only contain so much within flesh and bone, must break up the singular devotion of the angelic into something at least a little more human. So they bind their mind to their cause or their soul to a parabatai or their heart to a spouse.
But only once. The weight of those vows can be so so heavy. But breaking any one of them can easily be fatal.
So most Nephilim only bear one, that first one, to duty. If they bond their soul, they both agree it's to support their duty, and if one of them dies, the other probably follows.
Nephilim only love once; that's not about emotion, that's about the wedded union rune.
If they risk another bond, a spouse, the rune binds their magic and their strength, and part of why divorce is so rare is because if it's broken you can never have another one, and what soldier can choose to be weaker tomorrow than they were today, even weaker than time itself will make them?
Nephilim wed for children and strength and politics, but seldom love, because a broken heart on top of a broken bond...
Falling isn't something Angels recover from.
What does that mean for Alec, who shared his power with a Warlock he barely knew, who made that promise even without a rune, without a bond?
Because he doesn't need a rune to make a vow, not Alec with his singular ability to commit and accept his devotion once given and never waver in a way even Nephilim can't usually do, (in a way that frequently punishes the parts of him that are human, but he places so little value on those, that's not going to make him stop) even if that vow is just to himself and he never ever expects it to matter to anyone else.















