A Verminlord Warpseer must choose all its spells from the Lore of Ruin, and can re-roll failed casting attempts when attempting to cast the Warp Lightning spell from the Lore of Ruin.
Source: Warhammer Armies Project: Unofficial 9th Edition
A Verminlord Warpseer must choose all its spells from the Lore of Ruin, and can re-roll failed casting attempts when attempting to cast the Warp Lightning spell from the Lore of Ruin.