Yes, if you're in the current act - no, if you take pyramids from another act. The pyramids only seem to work if you have the appropriate ones from the current act. As Act 4 and Act 5 have no pyramids => you're out of luck.
How I know? I tried to help a gamer, by putting my Act 3 pyramids into his Act 2 save => didn't work. <img src="/ubbthreads/images/graemlins/shame.gif" alt="" /> It worked in his save with Act 2 pyramids though. Errhm, can you understand what I mean? I'm not sure I phrased clearly.
Duplication cheat was used by a gamer wrt pyramids => didn't work either.
Everyman420:
be prepared for long treks in the after game battlefields. sadly, the pyramids are still not available, and thus far i have been unable to make them work if i used Raze's methods for inventory editing and replacement of lost items/item duplication. as far as leaving and re-entering the battlefields at that point, well, that's not an option because it will clear your quest log. so you basically are stuck running. bah humbug.
oh well.
if someone finds a way to make the teleport stones work after re-adding them to the inventory, please let me know.