At the start of the Kislev turn, roll a D6 for each unit of Kvassnics. On a 1; The Kvassnics count as having failed a Stupidity test this turn. On a 2-4; the Kvassnics act as normal this turn. On a 5-6; the Kvassnics are subject to Frenzy this turn.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
At the start of the Kislev turn, roll a D6 for each unit of Kvassnics. On a 1; The Kvassnics count as having failed a Stupidity test this turn. On a 2-4; the Kvassnics act as normal this turn. On a 5-6; the Kvassnics are subject to Frenzy this turn.