Your first task should be to find a dormant quartz golem before thinking of releasing the kells. You need a large quartz crystal from it to do the run. If you find it, locate the the 6 small quartz crystals mentioned below and return with them and 600,000 gold pieces (might be more). Give the golem the small crystals followed by the gold in small increments until it activates, then kill it. Once it dies, loot the large quartz crystal and locker it.
Locating the gems
First off, obtain a spade and pickaxe. Then starting at the recall point of the Temple of Sumter, which is in the Towne of Rune on the mountain, head all north and kill the High Priest. Search the room and head down the stairs, then go all west. Make sure you're levitating and head north until you see a northeast, go northeast and down (through the floor), then sw, down, se, down, west, northwest, down, northeast, down, north, all west, all north, northeast and finally southeast. Go down one and dig up the quartz crystals, if there are none wait until repop. The next down also allows you to dig up quartz crystals. They repop, on average, every 15 minutes. You will need 6 of these to give to the aforementioned golem and another 6 of these to put in the altars.
Entering the Kell city
Once you have all the quartz crystals required, go all down, north and say "Akron Kalik Skevar". Prepare yourself to go into cpk and head all north after passing through a dizzy room. You'll come to a statue, say "wisdom cannot be given" and he will open a passage north. This is also where the golden cavaliers armor comes from and the faebane lance. Go north and check the corpse if you like, then continue all north, calm or kill the golems, and enter the columns. You must be levitated once you go in here, head all north and enter the next columns. From here just follow the path around, you'll get attacked by a whole heap of kell defenders, these are easy for anyone over third class.
You'll finally reach the solar chamber, around this area are 7 altars in total. Place a quartz crystal in each of the ones around the outside of the area, one in the 2 up from the center and the one 2 down from the center, once all the altars have shifted into black altars you can place the astral quartz crystal in the center altar. This will echo something about a loud crack echoing through the place as a plate cracks or something to that effect. The kells are now released in the entire area and in Lowangen.
Note: Completing this also awards the Mark of Irresponsibility.