A model with forge-proven gromril armour has a +4 armour save and a 6+ ward save. They also have a 2+ ward save against all hits with the Flaming Attacks special rule.
Source: Warhammer Fantasy: 8th Edition
A model with forge-proven gromril armour has a +4 armour save and a 6+ ward save. They also have a 2+ ward save against all hits with the Flaming Attacks special rule.