Combine this quote, partial transfiguration as the power Voldemort knows not (both true and foreshadowed by Dumbledore's reaction when Harry first revealed it), the previous weaponization of partial transfiguration when Harry transfigured a cross-section of the troll's brain into acid, the shaping exercises as a Chekov's Gun, and another Chekov's gun being Harry's resolution to drop the Batman "no killing" stance if the enemy killed again.
Harry wordlessly transfigures an atomic-thickness line of material from the tip of his wand through his clothes and the ground to all Death Eaters and Voldemort, let's say transfiguring their skins to acid. That would cause blood to spill in litres, a fraction of a line of silver, and probably a scream.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 113.
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
IMPORTANT -- From the end of chapter 113: