Geó-sceaft-gást

According to the Old English Dictionary:

es;

geó-sceaft-gást

m. A fatal, dire spirit[?] or ancient spirit[?] :-- Ðanon wóc fela geósceaftgásta wæs ðæra Grendel sum thence arose many dire spirits, Grendel was one of them, Beo. Th. 2536; B. 1266. geo-sceaft-gast