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.
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 gathered the 4 map pieces and talked to the cursed soul you can 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. Once you are ready, click the steering wheel to start the raid! Once on the ship, you can position yourself strategically on the right side. Healers can use the back corner of the ship. The event is time based.
Mission 3: arrival on Nightfall
Once you finish the raid you will be able to talk to the Cursed ghost and travel permanent. Your next task is to talk to the Nightfall guard and ask about a key. Make sure to have 1 ham with you. This key will give you access to the Crypts on the southern part of the island.
There are several crypts, your goal is to explore the correct one until you find the Nightfall priest. He will give you a Vial of Water and explain you how it works. You will also close your first mini portal.