In the OED, it means ignis fatuus, will-o’-the-wisp. Does it mean something different here? I believe so!
- 08.117 where we last saw the elf-fires.’
- 08.124 where elf-fires had been.
“elf, n.1.” OED Online, Oxford University Press, June 2017, http://www.oed.com/view/Entry/60431. Accessed 13 September 2017.