Dwarf war machines can be inscribed with engineering runes. Note that a shot from a war machine with an engineering rune is a magical attack.
A war machine engraved with a Rune of Penetration increases the Strength of its shots by 1, to a maximum of 10.
A war machine engraved with two Runes of Penetration increases the Strength of its shots by 1, to a maximum of 10, and allows the user to re-roll a single failed To Wound roll during the course of the battle. A third Rune of Penetration has no further effect.
Note that in the case of a Grudge Thrower, this bonus increases the Strength of both Strength values in its profile.
One use only. A Dwarf player can cause a war machine engraved with the Master Rune of Immolation to explode at the end of any round of combat before determining the combat results. Both the war machine and all its remaining crew are instantly removed from play, and each enemy unit in combat with the war machine suffers 2D6 magical Strength 4 hits with the Flaming Attacks special rule, allocated as for shooting. Any surviving enemy units who charged that turn may make an overrun move as normal. This rune will also be triggered automatically when the war machine loses its last Wound in close combat.
A war machine engraved with the Master Rune of Disguise always counts as being in hard cover.
A war machine engraved with a Rune of Accuracy has a +1 bonus To Hit. If it does not use Ballistic Skill To Hit, it can instead re-roll the scatter dice. If the scatter dice is re-rolled, you must accept the results of the second roll. Multiples of this rune have no further effect.
A war machine engraved with a Rune of Forging can re-roll the artillery dice whenever a misfire result is rolled; however, you must accept the result of the second roll. Multiples of this rune have no further effect.
Bolt Throwers only. A war machine engraved with Flakkson's Rune of Seeking grants +1 To Hit against any units with the Fly special rule. Multiples of this rune have no further effect.
A war machine engraved with a Stalwart Rune confers a +1 bonus to its crew's combat result score.
A war machine engraved with two Stalwart Runes confer a +1 bonus to its crew's combat result score, and its crew also gains the Unbreakable special rule. A third Stalwart Rune has no further effect.
All shooting attacks from a war machine engraved with a Rune of Burning have the Flaming Attacks special rule. Multiples of this rune have no further effect.