Trap Engineer( Dungeonscape, p. 46)
You have spent a great deal of time studying trap construction and recognize the work of famous builders, which gives you an edge against their devices.
Knowledge (dungeoneering) 4 ranks, Knowledge (architecture and engineering) 1 ranks,
You know the styles of famous dungeon architects or recognize their influences. After finding or setting off a trap in a dungeon, you gain a +2 bonus on future Search checks and Disable Device checks to find or disarm traps in that same dungeon. You also gain a +4 bonus on Reflex saves to avoid traps in that dungeon, and a +4 dodge bonus to Armor Class against attacks made by traps in that dungeon.