Invulnerable

Lord Bragdor’s armor stands in the Hall Of Heroes, as shiny as the day he was speared through the face in a jousting tournament.
“It was enchanted with an invulnerability spell,” said the Hall’s custodian, The Blue Wizard. “But, his visor was loose and his opponent very lucky.”
“Wouldn’t the lance have been knocked aside by the spell?” asked his apprentice Morstrawl.
“If the invulnerability had been meant for Lord Bragdor, yes,” said Blue. “But due to my misreading the spellbook, it was the armor that was invulnerable.”
The apprentice nodded, realizing why he had never had to polish it.