Ironhide fires on melee hit. On a piece that carries it it reads: Melee hits have a {chance}% chance to grant +{value} Armor for 3 s.

Word for word it is Melee hits have a {chance}% chance to grant +{value} Armor for 3 s, and the number in it grows with the gear: 10 to start, 1 more for every item level, at a 30% chance.

0 bases carry it.