Toran Darell II (Second Foundation) is the son of Toran and Bayta Darell and the father of Arkady Darell, and was known for his advances in electroencephalographic analysis. He was able to quit his job as he receives a stipend from the Foundation due to his mother's services in thwarting the Mule. The stipend is sufficient for a comfortable home in a pleasant suburb, and allows the presence of a servant named Poli to take care of him and his daughter. His abrupt resignation was due to fear that the Second Foundation might learn of his activities and adjust him.
Together with Pelleas Anthor, Jole Turbor, Dr. Elvett Semic and Homir Munn, he tried to locate the Second Foundation in hopes of eventually destroying it.
He discovered that the mental manipulations by the Second Foundation left a detectable pattern in brain wave activity, and called it a “Tamper Plateau.” Using this, he could determine who had been directly affected by the Second Foundation. With Semic, he developed a mind static device capable of protecting against this, and further refined it into a weapon against Second Foundationers. With the use of this, he and the First Foundation seemingly destroy the Second Foundation; the small group that is revealed is a decoy, though, and the Second Foundation survives on Trantor.
Read more about this topic: List Of Foundation Series Characters