>>14056217
Not an expansion. It was the "anniversary edition" that's basically a major update by THQ nordic. It was given for free to anyone who owned TQ on steam. It's currently 80% off on steam stand alone.
They added some items, but mostly they just overhauled it to work better.
>>14055684
>>14055707
Titan quest is always a bit slow and just lacking. It suffered a great deal of executive meddling in development and never really came out as the game they intended. It's still OK as diablo-likes go but not that great.
As far as specs, I HIGHLY recommend Storm mastery. There's an ability in there that will pretty much negate the massive and instantly-deadly swarms of archers that appear in the last act (squall I think), also a great weapon buff.