

In Spire, Sirrus's (s)he finds evidence that Sirrus was using his scientific knowledge to manipulate the floating rocks in hope of finding a way out of the age. However, (s)he also finds no sign of Achenar within the age and finds evidence of him breaking out of Haven and accessing the Tomahna linking book.
MYST IV REVELATION DELL HOW TO
In Haven, Achenar's prison, (s)he then learns that Achenar has adapted to the primitive lifestyle, learning the jungle and how to hunt and even befriending several of the creatures. However, (s)he does find an amulet, which contains the power to view an object's memories, which shows Yeesha running from an unknown individual.The Stranger then finds the linking books to Haven and Spire. The Stranger then begins exploring Tomahna and is knocked out by a mysterious blast and awakes later after nightfall, with no sign of Yeesha anywhere. He then returns to Rime, where he becomes trapped due to an electromagnetic storm. Yeesha brings The Stranger back to Atrus, who asks you to visit the two prison ages and determine for yourself whether or not the two have reformed and are worthy of release. Instead, he has imprisoned them within the ages of Spire and Haven in an attempt to reform them. The game begins with Atrus writing a letter to The Stranger, inviting them to Tomahna and confessing that Sirrus and Achenar did not die when he burned their prison books as previously believed.

Spoiler warning: Hints, solutions, and/or spoilers follow.
