Santelmo
Santelmo is the Filipino name for a ball of fire said to lead night travellers astray. The name comes from St. Elmo's fire, though Wikipedia says the folk light is described more like ball lightning.
Isabelo de los Reyes, in El Folk-lore Filipino (1889), recorded that the fire of San Telmo misleads walkers. It seems close, like the light of a house, and drifts off as they approach. A person lost at night should take off their shirt and put it back on inside out.
Esquire Philippines, in a 2021 piece on the santelmo in Trese, quotes Ramos, who writes that Tagalogs, Visayans and others speak of a fireball in fields and swamps that bounces and rolls away and can become a fire-mouthed beast. Travellers and fishermen follow it until they are worn out and lost, stumbling into mud and thorns, dizzy and out of their minds. Turning their clothes inside out sends it away.
Wikipedia's article on St. Elmo's fire says the Filipino santelmo, short for apoy ni San Elmo, is either a flying spirit or a bad omen, and that its description is closer to ball lightning. It says indigenous names for the light existed before the word santelmo, which dates from Spanish colonial rule.
MIT, via ScienceDaily in 2020, describes St. Elmo's fire itself as a corona discharge: a blue glow at the tips of towers, poles and other tall conductive objects during thunderstorms, when the air around them is briefly ionized.
"--El fuego de San Telmo extravía á los caminantes. Aparece como si estuviese cerca y si nos aprocsimamos á él, creyendo que es luz de una casa, se aleja insensiblemente. Si en una noche nos extraviamos, debemos desnudarnos la camisa y luego volver á vestirla pero puesta revéz."
- St. Elmo's fire, Wikipedia
- How airplanes counteract St. Elmo's Fire during thunderstorms, Massachusetts Institute of Technology via ScienceDaily (2020)
- The Enigmatic Philippine Origins of Trese's Santelmo, Esquire Philippines (2021), via Wayback Machine