You unlock heroic dungeons in TBC at level 70 , and most of them also require the matching reputation key or attunement from the faction tied to that dungeon.

How it works

  • You must be level 70 to enter heroic mode for TBC dungeons.
  • You also need the right heroic key , which is bought once you reach the required reputation with the dungeon’s faction.
  • Common heroic factions include Honor Hold/Thrallmar, Cenarion Expedition, Lower City, and Sha’tar.

Reputation needed

  • The usual unlock point is Revered reputation with the relevant faction, then you buy the key.
  • Some dungeons are tied to specific faction reps, so the key you need depends on which instance you want to run.

Example

  • Blood Furnace heroic is level 70 content, and it uses the Flamewrought Key for access.

Practical tip

  • If you’re just starting out, run the normal versions and do faction quests first, because that’s the fastest way to build the reputation needed for heroic access.

If you want, I can also list every TBC heroic dungeon and the key/reputation needed for each one.