The wielder gains the Ice Attacks special rule. If a model suffers one or more Wounds from the Frostblade (after saves) they are slain outright and lose all remaining Wounds.
Source: Warhammer Armies Project: Unofficial 9th Edition
The wielder gains the Ice Attacks special rule. If a model suffers one or more Wounds from the Frostblade (after saves) they are slain outright and lose all remaining Wounds.