Take Sebastian's quest on Icarus then head to the deadzone, look for a hatch door somewhere.

Then where is Sebastian

引用自 有效的名称：

Then where is Sebastian

He will be infront of the main building on Icarus once all the NPCs have vanished. There are several videos on YouTube to help you out with it too :)

引用自 Animatic：

引用自 有效的名称：

Then where is Sebastian

He will be infront of the main building on Icarus once all the NPCs have vanished. There are several videos on YouTube to help you out with it too :)

Then how to make all the NPCs on Icarus vanished

引用自 有效的名称：

引用自 Animatic：

He will be infront of the main building on Icarus once all the NPCs have vanished. There are several videos on YouTube to help you out with it too :)

Then how to make all the NPCs on Icarus vanished

Do EVERY single quest in the map mainly. Notable ones are the military quests on icarus island, earn that one persons trust in the survivor sz and do all of sebastions wacky stuff.