Voldemort might be failing to anticipate partial Transfiguration that has no visible effects (although it’s unclear why Harry is allowed to hold the wand after the Vow is done). It might be Transfiguration of the tip of the wand or of a patch of own skin. Transfiguring it into carbon nanotube wires (Ch. 28) or something else super thin that’s good at cutting things might make the result both deadly and invisible, while keeping the amount of stuff small in order to be able to complete the process in reasonable time (as with cutting the wall in Azkaban, Ch. 58). There is a problem with moving the Transfigured wires into place, but the “shaping exercises” (Ch. 104) might allow doing that using the process of Transfiguration itself (so that the original material might “grow spikes” that climb like vines over the area where the Death Eaters are standing and then rise up into place).
In Ch. 111 we see that it’s possible to gradually break a Transfiguration (without a wand). This might gradually transform the wires back into a small object, cutting the Death Eaters into pieces in the process. The alternative ways of triggering the wires might be to yank them quickly enough; to prepare a simple contraption as part of the Transfiguration, to pull the wires without Harry’s movement (a falling stone, if one is conveniently positioned, etc.); or to use the “shaping” process to perform the cutting movement as part of the Transfiguration itself. Possibility of some of these things depends on knowledge that Harry probably has, but readers aren’t certain about.
If the hypothesis that magical resonance hurts Voldemort more than Harry is correct, the same action would also incapacitate Voldemort, countering superior magic. Anything less, like doing something to the gun, seems pointless, and magical resonance seems to be the only adequately strong available weapon, so this risk should be taken if there are no better alternatives.
This requires some time, so the first thing should be to start talking. It can’t be about partial Transfiguration, but perhaps Dementors could be explained (even if this can’t help Voldemort cast Patronus 2.0, maybe it can make him a master of the Cloak, or allow training a minion to cast Patronus 2.0). Another point that I don’t see how to rule out is the possibility that Harry’s death would send him into Voldemort’s Horcrux network, which might harm Voldemort or lock him out. Discussing this might also buy some time, maybe a lot of time if Voldemort agrees that this is a serious risk that requires further study before Harry can be allowed to die.
If the move is successful, Voldemort needs to be incapacitated both inside or outside the Horcrux network, so the damage to the currently accessible body should be limited. It’s still not clear that he can be incapacitated in a body, since he mentions ability to abandon a body at will (Ch. 107), but magical resonance might make him temporarily lose consciousness (evidence from Azkaban), giving time to put the body into some further containment. Perhaps he can be locked in with brain damage. I’d guess that Transfiguring Voldemort’s body into something inert like a tree wouldn’t stop the spirit from leaving it. Maybe if the body is surrounded by a sphere of material Transfigured by Harry, then magical resonance would prevent the spirit from escaping, though I don’t see how we can expect this with any reliability, since the nature of this spirit thing is unclear. (Any solution to Voldemort containment that involves Transfiguration could be made to last with Philosopher’s Stone, although applying the Stone to Harry’s resonance Transfiguration should be first put to test, to check if the resonance remains intact.)
Following the principle that a disaster must be averted at every possible point of intervention, all these potentially useful measures should be applied at the same time. Even if the body is contained, Resurrection Stone and other horcruxes should be found and destroyed.
(By the way, tearing stars apart is just good sense, to use their matter and energy more efficiently. This might be a nice project to undertake sometime after defeating death and before the end of the world.)
Voldemort might be failing to anticipate partial Transfiguration that has no visible effects (although it’s unclear why Harry is allowed to hold the wand after the Vow is done). It might be Transfiguration of the tip of the wand or of a patch of own skin. Transfiguring it into carbon nanotube wires (Ch. 28) or something else super thin that’s good at cutting things might make the result both deadly and invisible, while keeping the amount of stuff small in order to be able to complete the process in reasonable time (as with cutting the wall in Azkaban, Ch. 58). There is a problem with moving the Transfigured wires into place, but the “shaping exercises” (Ch. 104) might allow doing that using the process of Transfiguration itself (so that the original material might “grow spikes” that climb like vines over the area where the Death Eaters are standing and then rise up into place).
In Ch. 111 we see that it’s possible to gradually break a Transfiguration (without a wand). This might gradually transform the wires back into a small object, cutting the Death Eaters into pieces in the process. The alternative ways of triggering the wires might be to yank them quickly enough; to prepare a simple contraption as part of the Transfiguration, to pull the wires without Harry’s movement (a falling stone, if one is conveniently positioned, etc.); or to use the “shaping” process to perform the cutting movement as part of the Transfiguration itself. Possibility of some of these things depends on knowledge that Harry probably has, but readers aren’t certain about.
If the hypothesis that magical resonance hurts Voldemort more than Harry is correct, the same action would also incapacitate Voldemort, countering superior magic. Anything less, like doing something to the gun, seems pointless, and magical resonance seems to be the only adequately strong available weapon, so this risk should be taken if there are no better alternatives.
This requires some time, so the first thing should be to start talking. It can’t be about partial Transfiguration, but perhaps Dementors could be explained (even if this can’t help Voldemort cast Patronus 2.0, maybe it can make him a master of the Cloak, or allow training a minion to cast Patronus 2.0). Another point that I don’t see how to rule out is the possibility that Harry’s death would send him into Voldemort’s Horcrux network, which might harm Voldemort or lock him out. Discussing this might also buy some time, maybe a lot of time if Voldemort agrees that this is a serious risk that requires further study before Harry can be allowed to die.
If the move is successful, Voldemort needs to be incapacitated both inside or outside the Horcrux network, so the damage to the currently accessible body should be limited. It’s still not clear that he can be incapacitated in a body, since he mentions ability to abandon a body at will (Ch. 107), but magical resonance might make him temporarily lose consciousness (evidence from Azkaban), giving time to put the body into some further containment. Perhaps he can be locked in with brain damage. I’d guess that Transfiguring Voldemort’s body into something inert like a tree wouldn’t stop the spirit from leaving it. Maybe if the body is surrounded by a sphere of material Transfigured by Harry, then magical resonance would prevent the spirit from escaping, though I don’t see how we can expect this with any reliability, since the nature of this spirit thing is unclear. (Any solution to Voldemort containment that involves Transfiguration could be made to last with Philosopher’s Stone, although applying the Stone to Harry’s resonance Transfiguration should be first put to test, to check if the resonance remains intact.)
Following the principle that a disaster must be averted at every possible point of intervention, all these potentially useful measures should be applied at the same time. Even if the body is contained, Resurrection Stone and other horcruxes should be found and destroyed.
(By the way, tearing stars apart is just good sense, to use their matter and energy more efficiently. This might be a nice project to undertake sometime after defeating death and before the end of the world.)