Looking for any class/prestige class/feats that specializes in dungeons

[Brennan1612]

Looking for any class/prestige class/feats that specializes in dungeons or tighter quarters, most 3.5 books are allowed, though not the magazines

[Troacctid]

Off the top of my head: cavelord, dungeon delver, dungeon lord, shade hunter, hoardstealer, cavestalker, loredelver, temple raider, silver key.

[ShurikVch]

Beast Heart Adept (Dungeonscape) - Requirements: "Special: Spend at least one week living alone in a dungeon complex."
Breachgnome (Races of Faerûn)
Dark Hunter (Complete Warrior)
Darkrunner (Lords of Madness)
Deep Diviner (Underdark)
Deepwarden (Races of Stone)
Earth Dreamer (Races of Stone)
Haztaratain (Secrets of Sarlona)
Prime Underdark Guide (Underdark)
Stoneblessed (Races of Stone)
Stonedeath Assassin (Races of Stone)
Stonespeaker Guardian (Races of Stone)

[meschlum]

Dungeoncrasher Fighter?
Gelatinous Cube Monk?