All non-magical attacks suffer a -1 penalty To Wound the Vermillion Warbird, and in addition, models that begin the Close Combat phase in base contact with the Vermillion Warbird take a single Strength 4 hit with the Flaming Attacks special rule.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
All non-magical attacks suffer a -1 penalty To Wound the Vermillion Warbird, and in addition, models that begin the Close Combat phase in base contact with the Vermillion Warbird take a single Strength 4 hit with the Flaming Attacks special rule.