I'm in WCIII-Reign of Chaos, Chapter 8: "Under The Burning Sky". I can't get past the last 30 seconds or so of protecting Kel'Thuzad. He's at Level 8 and Arthas is Level 9. I keep getting killed too often and losing levels.
No matter how much I mass Frost Worms, Abominations, Crypt Fiends, etc. I still get swamped and can't hold 'em off for that last 20-30 seconds. I try to build up as many Ziggerats as I can to protect my base, but then I can't get in enough gold to build other forces in time. I use Arthas' healing ability on Kel'Thuzad for awhile to keep him alive, but then Arthas ends up getting fragged. There's too many of them!
HELP!!!!!!!!!!