I am fairly new to this game, which is my first 4x game, so please bear with me.
I'm on my fourth game now, playing the 1.3 version currently, and ran into the Dark Sorcerer for the first time. Or, more accurately, he ran into me. On a somewhat difficult medium map I was struggling to find crystal when I went around a corner of the map and found a spot with two crags nearby. I managed to settle a city there just as Magnar put an outpost near the farthest crag.
A short time later I get the "World Gets More Dangerous" event and then notice that the Dark Sorcerer has appeared. Now I'm not alarmed by this as I've seen other monsters appear in previous games and I normally have had time to prepare for them as they wander about. But I've read here that the Sorcerer is a particularly nasty guy and in this case the Sorcerer and his dragon buddy appear right along the only roadway to get to my new crystal city (mountains block all other timely access) and worst of all, they start heading directly for my city! Just two short turns later my lovely city is wiped out.
Now if that was the end of it I could handle it, but the kicker is that Magnar showed up at his adjacent outpost a couple of moves later and proceeded to build his own city right where mine was destroyed - and the Sorcerer didn't bother him one bit! When I later stuck my nose carefully around the corner a bit to see if the Sorcerer and dragon were still there, they actually moved towards my army and attacked it, continuing to ignore Magnar's own units and resources.
I suppose this is just another example of the "monsters don't attack the AI" problem, but it sure is frustrating. Does this still happen in 1.4?