I dont know about endgame, but if im gonna play HC with classes, the build i enjoyed the most (at least initially, from levels 1-90 as an MC farmer and to unlock majority of blueprints/faction vendor items such as XP pots) was the original Immortal Army by @Contragor ontragor
ontragor
…lol okay, i dont know what the hell happened right there, but the build is by Contragor and its amazing. Fastest leveling build i ever played, though that could have changed since i played it last (which was before 1.1.9.0).
Another build thats probably even safer and also quick to level is @Nery’s Vitality Caster Conjurer. As others have already mentioned, Vitality Conjurer is a really stable and strong build. This build in particular may be a beginner build, but in my experience its VERY strong so do not be discouraged by that. Probably a great option for HC.