On Alinea anvils have been changed in 2 important ways.

  1. Modifying or repairing an item multiple times in an anvil does not increase its experience cost. In Vanilla Minecraft, after repairing an item mutliple times times in an anvil, the cost quickly becomes too high. On Alinea, you can keep repairing and enchanting items through anvils forever.
  2. The anvil has no maximum level cost anymore. This allows players to make powerful weapons using the unstable enchanting system.