HC is a learning curve for sure, and I have a terrible track record with sorc, think I've lost three but I did get the last one to Guardian before biting the dust in later Chaos runs

Be very wary of unique packs even in nightmare. The wrong combo can spell doom very quickly.
I've got a fully decked telezerker working toward lvl97 on HC and even then had a few close shaves with him. Even when you feel invincible, trust me you're not

Gonna start another HC character?