Not immediately relevant to anything, but on re-reading the last few chapters I’ve figured out what hex would be utterly devastating to Voldemort while also being something he might not think to calibrate his shields against: the Hurling Hex. Cast on a broomstick, it makes it go out of control and attempt to violently cast off its rider. Voldemort’s bones count as broomsticks.
Not immediately relevant to anything, but on re-reading the last few chapters I’ve figured out what hex would be utterly devastating to Voldemort while also being something he might not think to calibrate his shields against: the Hurling Hex. Cast on a broomstick, it makes it go out of control and attempt to violently cast off its rider. Voldemort’s bones count as broomsticks.