The Tower Outta Nowheres is a secondary quest in The Witcher 3 that takes place on a small island in the northern part of Skellige. To begin, travel to Urialla Harbor and look for a group of fishermen talking about the endless rain.
Speak with them, and they will tell Geralt about a mysterious tower that suddenly appeared on the island. Here is a complete walkthrough, including the steps that can be confusing and the rewards you can find inside the tower.
After speaking with the fishermen, they will ask Geralt to investigate the tower. They will also inform him that a small group of villagers and a druid entered the structure earlier but never returned, so you should look out for them if you can.
Follow the quest marker to reach the tower and enter it to find a portal. You will arrive in a larger room with several doorways blocked by purple barriers. After a system identifies Geralt as an intruder, a Golem will approach and attack you. Defeat it before proceeding.
Once the fight is over, look to your left and speak with the man behind the barrier. He is a mage who introduces himself as Sigo Buntz, and initially believes the tower is still in Kovir. Geralt explains that it has been teleported to Skellige, prompting Sigo to explain the situation.
The tower contains a defensive mechanism called the Defensive Regulatory Magicon. This system caused the tower to teleport to the island and has been responsible for the endless rain. To disable it, the mage needs the previous owner's treatise, Gottfried's Omni-opening Grimoire. He explains that the book should be in the Library, but you will need a key from the Laboratory to access it.
Before leaving the room, loot the area and investigate the dead bodies to learn more about the villagers who entered the tower. Next, head through the purple barrier on the opposite side of the room. You will enter a flooded area where you must swim through the water. When you reach the split in the path, take the left route to enter the Laboratory.
The defensive system will summon several enemies, including Alghouls, a Gargoyle, a Werewolf, and a cow. Deal with each encounter as it occurs, then thoroughly loot the area and investigate the bodies.
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