Periclitor's most infamous act was the Arios Point Massacre he unleashed against the Howling Grifffons Chapter in 220.M38. It was this massacre that finally pushed the Howling Griffons far beyond the tipping point in their lust for vengeance against the Word Bearers. The Chapter Master at that time was Orlando Furioso. He was travelling aboard one of the Chapter’s Battle-Barges, along with the 8th Company and much of the Veteran 1st Company. They were en route to the Chapter’s homeworld of Mancora, to celebrate the 5,000th anniversary of the Chapter’s Founding. When the Battle-Barge stopped in the Arios Point System to resupply, Periclitor, then still a Chaos Lord, led a combined force of Word Bearers and Night Lords Chaos Space Marines in ambush against the Loyalists. The Howling Griffons