Imperius a Legilimens, or have him Imperiused; use him; kill him. We already know from canon that someone under the Imperius curse can in turn Imperius another, so it seems likely that being under the curse doesn't affect one's magical ability too much.
Imperius a Legilimens, or have him Imperiused; use him; kill him.
That was my first thought. Possibly add in some obliviate-and-confine based recycling of the legilimens just as a practical consideration.
- This thread has run its course. You will find newer threads in the discussion section.
Another discussion thread - the fourth - has reached the (arbitrary?) 500 comments threshold, so it's time for a new thread for Eliezer Yudkowsky's widely-praised Harry Potter fanfic.
Most of the paratext and fan-made resources are listed on Mr. LessWrong's author page. There is also AdeleneDawner's collection of most of the previously-published Author's Notes.
Older threads: one, two, three, four. By tag.
Newer threads are in the Discussion section, starting from Part 6.
Spoiler policy as suggested by Unnamed and approved by Eliezer, me, and at least three other upmodders:
It would also be quite sensible and welcome to continue the practice of declaring at the top of your post which chapters you are about to discuss, especially for newly-published ones, so that people who haven't yet seen them can stop reading in time.