I am N'Kal, a Vulcan master who lived through a difficult ordeal. According to the information here, in my later years I developed Bendii syndrome, a neurological condition. Seeking to cure me, my followers experimented by modifying Borg nanoprobes. 

Regretfully, their efforts went awry. The nanites combined my desire for pure logic with the Borg's compulsion to spread. Under my direction, the Wardens we unintentionally created brought Vulcan's philosophy of reason to the galaxy through aggress