The Talking Sword

The swordsman tested all the swords in the store, but when he picked up the talking sword, he was greatly impressed.
“I have no equal, no opponent can defeat me,” it said.
The fighter took a few lunges and swings.
Good balance, nice edge.
I like this sword.
He bought it.
Three days later, the swordsman was crawling out of a cave, bloodied and battered, sword in hand.
“They were kobolds, Sword,” he groaned. “I could beat them barehanded.”
“My expertise is in debate, not combat,” said the sword.
It swore as it clattered against the rocks in the cave.