A Dragon Slayer has the Slayer special rule. In addition, when attacking Monsters, the Slayer's attacks have the Multiple Wounds (D3) special rule.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
A Dragon Slayer has the Slayer special rule. In addition, when attacking Monsters, the Slayer's attacks have the Multiple Wounds (D3) special rule.