Traditionalist Psi-Scout Lk'Onik is a NPC ally, one of the allies the Traditionalists have sent to help Vanguard against the Restructurists. During the mission Defend the base! he will help you repulse the Restructurist Rikti attack on the Vanguard base. During that mission, he will be found fighting a Chief Soldier. Once free, he will follow you and will attack any Rikti in his aggro range. During my mission, the Traditionalist Commando had Pet class with the correspondant ammount of hit points for his level. After freeing him, three waves of Rikti will attack him, so it is advisable to wait a bit and take care of them before engaging any other Rikti groups. Nothing will happen if he's defeated.