@Juniper we don’t really know the big Arx 2 selling points at this point, since it hasn’t opened yet and apos hasn’t publicized details at this point.
but for the original arx, i’d say the biggest selling point was the very extensive lore and the sense of mystery in exploring it. the setting was built in such a way that ignorance was baked into the theme: there were magical reasons the populace had forgotten a lot of stuff about magic and their land’s history, so there was a very deep sense of discovery that i think was pretty addictive for a lot of people. and the really rich lore meant that the world felt very real, and thus very rich and rewarding to play in.
that was my personal favorite part of it, at least!