Leveling up on mindreading is the same as leveling up on any other skill, such as firewall or ghost.
Once you have skill points to spend, go into your skills and look under Dragon Slayer. Mindread is the first one up the top which looks like a humans head.
Click on it to allocate points.
Please note that with certain skills, you have to be at a certain level before you can allocate more points to a skill.
You never face Maxos seeing as Maxos is dead. I think you are referring to Amdusias, and the answer is no seeing as you cannot become a Dragon at that point of time.
To beat Amdusias you will need a vile of his blood, Dragon Scales and the Orbis Arcesso Part Two.
To become a Dragon, you will need to defeat Razakel and Laiken in the Battle Tower, and acquire the Dragon Stone which is also in the Battle Tower.
This is part of the main game so you will get to it soon.
I’m assuming the evil wizard you are referring to is Mundus, as that is the only quest I know of that uses runes, unless you are referring to something in Divinity II: Flames of Vengeance. If that is so, then I suggest you move your question here so you can get the answer you wish.
Now, if it is Mundus, here's what you have to do.
The first two runes you can acquire from the rune troll you must face outside the magical barrier. Go around to the other magical barrier and you will see that there is already a magical rune on one of the plates. Place a rune on the other plate. Use the elevator and go up. Exit the elevator. After your conversation with Mundus, go past the trolls to the magic barrier. Just like that barrier before, you will see that there is already a magical rune on one of the plates. You merely need to put one on the other plate to remove the barrier.
If you are referring to finding the chicken rune to finish the quest, you will find it in the cave behind the waterfall. When you come to the area, where you can turn right towards the dragon statues or straight. Go straight and you will find it in the room full of chickens.
First off, it should be known that not all barriers can be taken down.
So, to take down the barriers in the beginning, starting from the first waterfall you see in Orobas Fjords, hug the cliff on the left and head towards the nest under the barrier on the left. Fly across it and on the cliff above it you will see a teleporter. Use the teleport you are after. It will take you to a bunker in the anti-dragon zone. Enter the bunker and fight two members of the Black Ring. After you have defeated them, go up the stairs; decide the fate of two more Black Ring warriors, before going to the end of the bunker and interacting with three levers. This will remove all the Dragon Barriers in the beginning.
Now, the barrier surrounding the small towns, you cannot remove.
To remove the anti-dragon shields at the far end of the Fjords, you will need to destroy certain goblin constructions. These constructions are illuminated by a blue energy force surrounding them. You will need to destroy them to bring down the barriers. Using fireball is a great tool for destroying them.