Errard is a lawful evilBaldur's Gate II:
Throne of Bhaal (2001)
This icon indicates content from the original Baldur's Gate II: Throne of Bhaal campaign. / goodBaldur's Gate II: Enhanced Edition – Throne of Bhaal (2013)
This icon indicates content from the Throne of Bhaal campaign of the Baldur's Gate II: Enhanced Edition. mage in Saradush, responsible for managing the city's defences. You will need to speak with him in order to complete the Good path of the Betrayal at the Gates quest.
If you opt to take the Evil path, then you either must kill Errard yourself or allow Kiser to do it while you kill the Countess.