Titles are earned by defeating the game on each difficulty level (Normal, Nightmare and Hell). This means killing Diablo in Diablo II (D2C, or D2 classic), and killing Baal in Diablo II: Lord of Destruction (D2X, or D2 Expansion).
Diablo II Titles
Normal softcore
Normal (softcore) character titles:
- Normal Difficulty: Sir, Dame
- Nightmare Difficulty: Lord, Lady
- Hell Difficulty: Baron, Baroness
Normal hardcore
Hardcore character titles:
- Normal Difficulty: Count, Countess
- Nightmare Difficulty: Duke, Duchess
- Hell Difficulty: King, Queen
Diablo II: Lord of Destruction Titles
Expansion softcore
Normal (softcore) character titles:
- Normal Difficulty: Slayer
- Nightmare Difficulty: Champion
- Hell Difficulty: Patriarch, Matriarch
Expansion hardcore
Hardcore character titles:
- Normal Difficulty: Destroyer
- Nightmare Difficulty: Conqueror
- Hell Difficulty: Guardian