If a model is permitted to take runic armour, he may choose armour runes from the following list and apply them to his gromril armour.
A model wearing armour engraved with the Master Rune of Adamant has Toughness 10. This rune cannot be combined with any other armour runes.
Armour engraved with a Rune of Fortitude grants its wearer +1 Toughness.
Armour engraved with two Runes of Fortitude grants its wearer +1 Toughness and a 5+ ward save.
Armour engraved with three Runes of Fortitude grants its wearer +1 Toughness and a 5+ ward save and, if the wearer suffers an unsaved Wound from an attack that has the Multiple Wounds special rule, roll a D6. On a roll of 2+, he only suffers 1 Wound, regardless of how many Wounds would normally be caused; on a roll of 1, he suffers the full number of Wounds.
Armour engraved with the Master Rune of Gromril grants its wearer a +1 armour save that cannot be improved upon in any way.
Armour engraved with a Rune of Preservation grants the wearer a 2+ ward save against the effects of the Killing Blow and Heroic Killing Blow special rules. Multiples of this rule have no further effect.
Armour engraved with a Rune of Shielding grants its wearer a 2+ ward save against Wounds caused by shooting attacks and all magic missiles. Multiples of this rune have no further effect.
Armour engraved with a Rune of Iron grants its wearer +1 Wound.
Armour engraved with two Runes of Iron grants its wearer +1 Wound and +1 Toughness.
Armour engraved with three Runes of Iron grants its wearer +1 Wound, +1 Toughness and the Regeneration (5+) special rule.
Armour engraved with a Rune of Impact grants its wearer the Impact Hits (1) special rule. Multiples of this rune have no further effect.
Armour engraved with the Rune of Stone adds +1 to its wearer's armour save. Multiples of this Rune have no further effect. The Rune of Stone is an exception to the Rule of Pride, meaning that several characters can wear gromril armour engraved with a single Rune of Stone.