Ryne-gæst

According to the Old English Dictionary:

es;

ryne-gæst

m. A guest or foe that comes swiftly (?), a term used for lightning :-- Feá ðæt gedýgaþ ðara ðe gerǽcaþ rynegiestes wǽpen few escape whom the lightning strikes, Exon. Th. 386, 8; Rä. 4, 58. ryne-gæst