Need help farming Jacqui's Aegis

I'm having trouble farming Jacqui The Reaver, only my ele is far enough in factions to farm him, but due to his high health bar E/A earth/fire builds dont work. I found a build to kill him while he is fighting a Ele boss - using mesmer's side degeneration and empathy, but Im not sure if I am asigned to get the drop since many monsters attack him too.

any help for an ele build is very welcome, 10K is waiting if you can farm me his shield

finally found some1 who had it, clase closed, plz delete

just take ignorance to stop his heal sig. i assume thats what he uses ?