Background
The Seeker is an intelligent Darkspawn Emissary that served The Architect. He was the mastermind behind the problems in the Wending Woods and the one who captured Velanna's sister Seranni alongside another Elf (who killed himself).
Involved In
The Seeker is indirectly involved with the problems in the Wending Woods. Being the one who planned out all of the events that caused the deaths of the Dalish Elf tribe in the area and Velanna's rampage. However he does not make a literal appearance through out the game and is only mentioned in letters written by The Architect describing the events.