How much is the steel armor in the game?
The kanji and the word are exactly the same. That means they share meanings as well.
Since this word is made up of a single kanji, it probably uses the kun'yomi reading. You did not learn this reading, so here's a mnemonic to help you:
You take a look at the steel. It's shaped like a person. Turns out you turned that hag into a steel statue. You say, "huh, that's the hag ね?" (はがね). Whoops, sorry hag lady.