After installing KotN and adding it to the active plug-in list, you'll find new topics of conversation with various NPCs. You should overhear conversations about an attack on the Chapel of Dibella in Anvil and people will have a "Prophet" conversation topic that will direct you to Anvil. You'll find The Prophet in the covered garden area across the street from the Chapel and next door to Benirus Manor. Although you can talk to the guard outside of the Chapel and go inside to look at the damage, you should wait to thoroughly investigate the Chapel until you have spoken to the Prophet so that all of the areas inside the Chapel can be accessed without trespassing.

The Prophet goes on and on about a threat from the ages of myth has come back to seek vengance. If you ask him about the attack, he'll tell you that "Umaril the Unfeathered," an Ayleid Sorcerer-King, was behind it all and that the only way to stop it is to find and use the Relics of the Divine Crusader, Pelinal Whitestrake. He will then ask if you are a worthy knight. Although there might be a lot of possible responses to that question, depending upon what you have done in the game up to this point, the only responses that will help you are the "no" responses. Then you need to ask about how to find the relics.

The Prophet tells you that you must make a pilgrimage to the Wayshrines of the Nine Divines and repent of your past misdeeds. You become a member of the Nine Divines faction with the rank of "Pilgrim" and he gives you a Wayshrine map.

Now you can go explore the Chapel and take whatever you'd like. It's pretty messy inside. Major items of interest (aside from the dead bodies and the runes on the floor around the main altar) are the eight voumes of The Song of Pelinal, Shezarr and the Divines, and The Adabal-a. There is also a copy of 2920 Frostfall (raises your Conjuration skill) in one of the bedrooms, but it's there whether the plug-in is running or not.

The Wayshrine quest works with any of the Wayshrines, not just the ones on the map the Prophet gives you. Your objective is to visit one Wayshrine for each of the Nine Divines. However, completing the pilgrimage does not add the "Pilgrim's Grace" power to your spell list. Instead, it reduces your Infamy to zero. If you completed the Wayshrines quest and received the "Pilgrim's Grace" power before loading the plug-in, you do not need to repeat it. Visiting a single Wayshrine should do the job and will reduce your Infamy to zero.

If you stick with visiting the Wayshrines on the map, however, you should eventually meet up with Sir Roderic and Lathon somewhere on the road. They are are making their own pilgrimage and you can travel with them if you wish (if Sir Roderic loses his horse, his travel path gets a little hinky). Both are essential, so it should make overland encounters a bit more bearable. But it isn't necessary to find them and you'll meet up again with both of them at a later point, although not under such pleasant circumstances.

Once you have completed your Pilgrimage, a couple of things will happen. First, Sir Roderic and Lathon will disappear from the world. Second, you'll have a vision (you're teleported to an area way above the Imperial City) where you meet Pelinal Whitestrake, who will point you to the location of the Shrine of the Crusader as the probable location of one of the Relics. No marker immediately appears on your map, but the compass will point you to an area just north of the long bridge on the south end of Lake Rumare. Be prepared to swim to your next mission.

Third, the game is going to make a decision about the Relics of the Crusader. If your Light Armor skill is higher than your Heavy Armor skill, then the Relics that you are going to find will all be Light Armor. If Heavy Armor is higher than or equal to Light Armor, then they will be Heavy Armor. The enchantments are the same either way.