First I have to say that level 8 feels like too low of a cap for this, but what can you do. Got hero on Hard with this: a Might/Tear Raelag with the Enlightenment specialty (I made a hero, but named him the same as the one they offer). Now I can not draw a map to save my life, and this is just one possible way to go, so ...
If you use Dynasty traits, here are the three I went with. Experience, (forgot the level cap, you reach it WAY before you end the map, so you can substitute here), Movement and the +150 points of racial gauge at the start of each combat (this also is not really needed, so feel free to substitute). You start at level 5, so chose your 5 skills before moving an inch. I also suggest picking up every crystal off the ground you see.
You start at A (click minimap to enlarge). There is a door blocking your way north at D. Start by clearing to the left of your starting point, then head north to clear out until you reach the door, and then finally head toward 1. There are some Stalkers at S1, which will start a side quest to pick up a total of 3 stacks of them. Make sure to clear out everything you can before heading up to S2. There is a mini boss here, and an absolutely useless fort. Send the angel packing and head toward 2. You've bypassed the door and when you have a set amount of crystals, you will complete a quest, and get to summon some back up. Head north toward p1. There is a building here which gives you some more assassins, and a one way portal. Remember it, you will be back. Head towards 3.
At M1, you pick up a few Minotaurs and get a quest to fight a haven army for more, but before we head to do that, there is a portal near the Minotaur that will take you to S3, where there is also an artifact merchant. Hope for something good that you can actually afford. Once you have done everything head toward P1 (which connects to p1 underground), but you have to fight a mini boss to access it. The good news is you claim some more Minotaurs if you beat him. Hit the portal. Start going towards 4, but clear out the entire area before you climb the stairs. Make sure you have full movement points when you surface at 4. You will get two quests, one of which you will fail. One is to fight, and get Blood points, one is not to fight and get Tear points. Since I went Tear, and since the level cap is easy to reach, I chose not to fight. At P there is a Sanctuary which you can hide your hero in. If you have Pathfinding, Logistics and the Dynasty traits I suggested, only for 1 day, though. At G you get a cutscene that the portal will open up. There is a Unicorn bow protected by some Haven archers here, I suggest claiming it if at all possible. Then through G we go.
It is impossible to get lost here, as there is only one way to go. You will have a fight, send them to meet Elrath in person, then start heading back to A. Fight or don't, doesn't matter, but just know that you have at least one fight left regardless if you outrun your 3 (yes 3 ... if you didn't kill the two patrols that is) pursuers. At A you will have a fight with a Dungeon hero and troops, but you should be more than a match for them.