Sentence:  Who forthwith from the glittering Staff unfurld / Th' imperial Enſign, which full high advanc't / Shon like a Meteor ſtreaming to the Wind / With Gemms and Golden luſtre rich imblaz'd, / <WSD>Seraphic</WSD> arms and Trophies : all the while / Sonorous metal blowing Martial ſounds... 
Meaning of the word marked with <WSD> tags:  Of or relating to a seraph or the seraphim.