The sleeping legendary telepaths were still in the Mindscape. But the Sleep divine ability had shifted the battlefield between them and the legend to somewhere favorable to the incarnation of the god of dreams.
The telepaths began to sleep and dream. Once they began to dream, their minds were infected through their dreams.
All of them were still lucid in their dreams and were able to resist the invasion. But their resistance was futile because they lacked the tools to resist.
The force that invaded their mind was formless like the Mind Plague. So if they had the Mind Plague divine ability, they would have been able to put up significant and meaningful resistance.
With the Mind Plague divine ability, they would have even been able to fight back. But without the Mind Plague's divine ability, they were like sheep to the slaughter.
Once all of their minds were infected, their minds were sacrificed to create a channel for the power of the god of dreams to enter the Mindscape.
