For strength, you use Dugbogs that were crushed by a strong Re'em.
For heat, you use bronze that was forged in a hot forge.
For immortality, you use a corpse that was burned by an immortal phoenix.
Speaking in terms of significance:
The Dugbogs were not crushed by a strong Re'em, but by a Re'em's strength. The strength was used to crush them, and the strength was what you got out of it.
The knuts were not forged by a hot forge, but by the forge's heat. The heat was used to forge them, and the heat was what you got out out it.
In your scenario, the immortality of the phoenix was not used to burn the corpse, so you cannot get immortality out of it.
The next discussion thread is here.
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 85. The previous thread has long passed 500 comments. Comment in the 15th thread until you read chapter 85.
There is now 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.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15.
As a reminder, it’s often useful to start your comment by indicating which chapter you are commenting on.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: