10-player · Deadwind Pass · 9 bosses
The 10-player gateway raid of TBC and the most-run instance of the expansion. A long, varied dungeon with puzzle-like encounters, Karazhan gears your whole roster for the 25-player content.
25-player · Blade's Edge Mountains · 2 bosses
A short two-boss 25-player raid: the multi-add High King Maulgar council, then Gruul the Dragonkiller and his ever-growing Grows. The first real 25-player coordination test.
25-player · Hellfire Citadel · 1 bosses
A single-boss 25-player raid built around the Hellfire Channelers and a raid-wide click event. Punishing to undergeared groups, trivial once coordinated.