Clan Verms

Clan Verms is a pitiful Clan, shunned and reviled by all others, even those lesser clans who cannot hope to compete with its rather limited power. Verms has affinity with insects, bugs, and other types of vermin. Many species of over-sized insects, spiders, and the like have been attributed to the experiments of Clan Verms.

Source

 * Warhammer Fantasy RPG 2nd ED -- Children of the Horned Rat pg. 50