Don't be relieved it works like this; physical damage can be healed. It is the way it is because this cannot. Applying life magic afterwards would make you no more than a healthy lemur. Or flying squirrel, or whatever member of the mammal kingdom you end up- as a human person and a personality you would be gone forever.
For rules purposes, I'm going to assume a collective resistance- because your odds are a lot better that way. Starting with the values of the most skilled among you, and augmenting with the rest, you should get close enough to a mass of resistance sufficient to stop it cold; resisting individually, each of you would likely be overmatched.
Right now, the most resistant's actually Larric. Stubborn complexity, mix of grasp of and tangents to reality, and dubious humour- humanity at it's best. Well, maybe not but it seems to be the most likely thing to actually work.
Detrick and Andrea are resisting too- Detrick's plan is to throw it in the fire, but Andrea stops him- 'he'd expect that, and if we breathe it,' if it goes up in smoke and people breathe the smoke, then the curse might strike them, she guesses, and you know what? She's right.
Off the page leaps a green, three (four? five?) dimensional knotwork, twisting and spinning and looping around itself, reaching past you all, dazzling in it's complexity and chilling in it's elegance, each of the coils itself a coil of words and symbols- he was not a god, but he has done his best to fake it.
The motive behind it may have been vile, but the thing itself is a work of art, of complex results from simple beginnings, of natural intricacy compelled to emerge and express itself- doublethink very evidently at work, a mind so capable of love of nature and hate of the human.
It's perfectly capable of doing what it's supposed to, against each of you alone it could hardly fail to do so. As it stands the centre of it shifts, coils around Larric, loops out to all of you though, (passing through and beyond the walls- the area of this one is large. Dangerously so- it would get the centre half of the castle mound)- and you feel the foundations of your minds start to slip away, the sense of being a person in a place and of being able to think begins to melt, ebbs and flows as you fight back-
Larric's doing what he can already, Verone diminished it a little before it could launch itself- the balance is close, and the pressure is on. Detrick and Andrea are resisting, as is everyone else still there. What is everyone else doing to tip the scales?
Caralus says to Eliska 'Consider the treasurer. He's old. Still subtle enough to do, but not to do tactfully- he doesn't realise it isn't working, that his plans are transparent.
For the good of the barony, he has to be stopped- but what can you honourably do to an eighty year old man who can barely walk? Defeat him in a checkers tournament? Most of what there might be to blacken his name and reputation was either taken to the grave or is public knowledge.
His sons, though, they may be his weak point. Something tragic should happen to them, perhaps. We need to work on that.
The constable has already managed to falsely accuse three good knights on the word of a habitual criminal- and may perhaps need another push, something else daft engineered for him.'
---OOC note; Kaelan, metagaming like that- assuming you had a "PC badge"- nearly got William and Alfred killed. The less of it you do, the better off all of your characters will likely be; by all means think it, feel free to point out the patterns, but don't act on it.