All it takes is a just about any area worthy of exploring because they have multiple mobs, limited areas for fleeing, and mobs that do lots of skills/spells. A acolyte conjurer was about the most superior tank I could imagine before the change that allows mobs to bring groupmates or cabal mates into battle. Allow your elemental or familiar to tank and simply altruism them until the mob or mobs are dead. Archon throws out killer damage sups from time to time and you remain more or less unharmed. But now, mobs will dirt often, trip, bash, throw spells other than area spells and then once the Archon is in battle, all your healing goes out the window. It was about the closest to easy mode that I could actually imagine.

Conjurers lack the ability to be great explorers any more for that reason alone. If there was a reliable method to stop mobs from attacking your archon it'd be different but flash isn't that reliable and is an area spell.

Still, overall, they're very powerful and in the right circumstances and played by the right person they're monsters and good explorers but not anywhere near what they used to be.