Sentence:  All the terror of time, where error and fear were lords of a world of slaves, / Age on age in <WSD>resurgent</WSD> rage and anguish darkening as waves on waves, / Fell or fled from a face that shed such grace as quickens the dust of graves. 
Meaning of the word marked with <WSD> tags:  Undergoing a resurgence; experiencing renewed vigor or vitality.