Primary Excavation Site - HELP ME!

Just how the hell do I kill this big Fella with the horns???? Nothing kills him. Nowhere to run!! HELP!

Have thy tried a FAQ text file?

"Big fella with the horns"? Oh brother, do you need a crash course in DOOM...

kill the imps and maggots and get your soul cube charged. attack the cyberdemon (the really big one) with the soul cube. lather, rinse, repeat.

Hmm, wait, I have no idea what level this is but I assume it's the first boss encounter in ROE...

Anyway, to defeat this foe you must use your newly accuired Grabber to snatch the fireballs from mid-air being launched by the automatic launchers, then toss the fireballs at the flying enemy.

If this isn't the dude you're talking about, sorry :-/

EDIT : Oh, the Cyberdemon. Yeah, charge your Soul Cube and use it on him.