Vervain was a Van Helsing male. His mother was either dominant female Flo, Bananas or Billy. His father was Titan. Vervain and a few other males went roving to find a a group of Riverclaws mob females led by former dominant female Vanilla. The two groups met up to form the Zion mob. Vanilla and Vervain took dominance. Since the dominant couple have names starting with V, the mob's offspring have the same strategy.