Nightfall is one of the bigger quest lines in Elderan. This quest line is a replacement of the tibia 7.4 Pits of Inferno quest line. The quest can be divided into pre-quest and main quest.
Pre-quest
Mission 1: recover the 4 map pieces
Head to the Plains of Havoc, east of the temple. You will find an underground base that will lead you through 4 tunnels. Your goal is to recover 4 map pieces and return them to the Cursed soul. Once you have gathered the all parts and talked to the NPC you will be able to enter the upper deck and sail to Nightfall. When exploring the ruins, you will face different type of monsters (e.g. demons, black widows, executioner, ...) and you will have to solve several small puzzles.
Note: you will need 2 persons to recover one of the map pieces.
Mission 2: sailing to Nightfall
After you collected the 4 map pieces and talk to the cursed soul and enter the upper deck. Make sure to gather enough people as you will have to face several waves of demonic creatures. You do not need 10 people but a small group is advised. When you are ready, click the steering wheel to start the raid! If you want you can position yourself strategically on the right side of the ship. The event is time based.
Main quest
Mission 3: arrival on Nightfall
When you finish the event you will be able to talk to the Cursed ghost and travel permanently. Say "Hi passage" and "hi trading port". Your next task is to find to the Nightfall guard and ask about a key. He is located at the entrance to Nightfall city on the southern bridge. Make sure to have 1 ham with you. This key will give you access to the Crypts on the southern part of the island.
Keep in mind that there are several crypts. Your goal is to explore the correct one until you find the Nightfall priest. He will reward you a Vial of Water and explain you how it works. He will also tell you to close the first mini portal. Be prepared to face a single misery.
Mission 4: portal in the archives
The library portal is located through the center of Nightfall city. You need a crowbar to break the front door. You will face several possessed books, blazing skulls, elder beholders and black widows. You will have to solve a small mini puzzle to be able to exit through the backside of the library. There you will meet Mefisto who will give you access to the secret passage if you provide him 30 demonic spirits. This is a good hunting spawn for Warlocks or if you want to farm the mini boss Apprentice of Urnas. Make sure to have a talon with you to leave.
Mission 5: portal on the city wall
The portal is located on the southern walls of Nightfall city on the 2nd floor. You will have to face several harpies, black widows, blood bats and watchers. This is one of the easiest portals.
Mission 6: portal in the prison
Portal in the prison is one of the hardest mini portals. You will have to fight your way through the city to reach the prison. Inside the prison you will face several executioners, furious mistresses, banshees, demons and even some hellhounds. The portal is located on the 2nd floor.