Conan Helps Out
 

Hello, we played, and one of us was the 9th level.
He played Anubis (unded) and quickly "Conan Helps Out". And he won.

But i had "Grave error", "Dead" and curse "-1 level", but they didn't decide anything as he said, because the combat is over. He's right or not?

Thanks

Re: Conan Helps Out
 

Not quite right. Conan Helps Out does not specify that it ends combat, which means you still have a reasonable time to respond after that card is played. You couldn't play Grave Error or Dead, but the "Lose a Level" Curse would absolutely be a valid move during that time.

The Munchkin FAQ has more questions and answers about timing and the end of combat.