Anvils are a pain in vanilla. 31 iron ingots each, and they still break on you after a while.
So now they cost 7. Same recipe you already know, just ingots instead of iron blocks.
And if one breaks a level, you can actually fix it. Just put it into a crafting table with an iron ingot and it goes back a level. Two ingots and it's like new again.
You can turn both recipes off in the config.
