St Elmo's fire is a natural phenomenon, previously regarded with religious awe. I follows that, in a universe where magic works, there will be a magical source of light called a "saintelmo" and indeed:
"I lit the saintelmo..."
-Poul Anderson, Operation Chaos (New York, 1995), p. 12.
Operation Chaos brims with such details and I will probably not attempt to compile a complete list. But such details always raise further questions:
Sailors may have considered St. Elmo's fire as a good omen (as in, a sign of the presence of their patron saint).
-copied from the Wiki article. See the above link.
Does St Elmo's fire at sea mean the presence of the saint? Does the Catholic Canon of Saints exist in the goetic universe? It seems that every other kind of supernatural being does. Do the saints intervene? Must St Elmo be invoked before a saintelmo can be lit?