Tolrek blames Beilon for his mother being shot, which takes the official and Darion by surprise, in Vaironian Tides, Chapter 30. Here’s an excerpt:
Beilon stared into Tolrek’s eyes, half-mystified and half-chilled, as Tolrek’s irises darkened to a malevolent greenish black. A ripple of energy that represented Tolrek’s craving to maim surged around him. His hands closed around Beilon’s throat, as he fixated on his target, wanting to feel the life drain out of him.