Barrow d'Kundarak

Partycrashers
Barrow can be seen in a reserved corner talking to Orphne. Talking to him will make he randomly say one of those lines:
 * Barrow d'Kundarak: I suppose that the Knives have a reputation for always succeeding...
 * Barrow d'Kundarak: That fee is insane! I though the other Laughing Knives were supposed to be the bloodthirsty ones!
 * Barrow d'Kundarak: I'm not sure that hiring the Laughing Knives would be worth our while.

Vault of Night
If you try to talk to him while at level 7 or lower, he will reply:
 * Barrow d'Kundarak: I'm sorry, access to the Vault of Night is available by appointment only.
 * Barrow d'Kundarak: And, appointments are granted to only the most exclusive of Stormreach citizens.
 * You: Can you at least tell me a little bit about the Vault of Night?
 * Barrow d'Kundarak: Certainly! House Kundarak is proud of our crowning achievement, the Vault of Night!
 * Barrow d'Kundarak: No other vault on Eberron has ever had the same level of security... traps, wards, guards... those are just the tip of the iceberg.
 * Barrow d'Kundarak: Kundarak's Mark of Warding allows part of the Vault to exist in the Plane of Night, which is why it's named so.
 * Barrow d'Kundarak: Why the Laughing Knives even tried to break in and failed. House Kundarak absolutely guarantees the impregnability of the Vault of Night!

Talking to him after helping all Laughing Knives and being at level 8 or higher, will make him say:
 * Barrow d'Kundarak: You're the ?
 * You: Yes, what of it?
 * Barrow d'Kundarak: Before the Laughing Knives went into the Vault of Night, they told me about you.
 * Barrow d'Kundarak: Last night unknown attackers broke in—they took complete control of the Vault. They even usurped the Vault's security systems! Everyone we sent after them were slaughtered, but I'm hoping you and the Laughing Knives will do better.
 * Barrow d'Kundarak: Know that if you breach the Vault of Night and destroy whoever is responsible for the attack, then House Kundarak will be grateful.
 * You: This sounds difficult, but rewards from the wealthiest Dragonmarked House may be worth it. Very well, I'll help you. (Bestow quest)
 * You: Tell me about the Vault of Night.
 * Barrow d'Kundarak: The Vault of Night is the crowning achievement of House Kundarak.
 * Barrow d'Kundarak: No other vault on Eberron has ever had the same level of security... traps, wards, guards... those are just the tip of the iceberg.
 * Barrow d'Kundarak: Kundarak's Mark of Warding allows part of the Vault to exist in the Plane of Night, which is why it's named so. If you enter the Vault of Night, you'll be in for... an interesting experience.
 * You: This sounds difficult, but rewards from the wealthiest Dragonmarked House may be worth it. Very well, I'll help you. (Bestow quest)
 * You: I'm sorry, but I don't have enough friends with me to help you. Goodbye. (Walk away)
 * You: I'm sorry, but I don't have enough friends with me to help you. Goodbye. (Walk away)

Talking to him after acquiring the quest, but before completion, will make him say:
 * Barrow d'Kundarak: Whoever broke in took complete control of the Vault. They even usurped the Vault's security systems! Everyone we sent after them didn't make it, but I'm hoping you and the Laughing Knives can.
 * Barrow d'Kundarak: Know that if you breach the Vault of Night and destroy whoever is responsible for the attack, then House Kundarak will be grateful.
 * You: Tell me about the Vault of Night. (see above)

On completion of quest, he will congratulate you with the following:
 * Barrow d'Kundarak: So you fought through undead... and the Aurum... and then a Red Dragon?!? And you found that traitorous Arach d'Kundarak to boot?!?
 * Barrow d'Kundarak: Who would have thought all of them would conspire together to breach the Vault of Night...
 * Barrow d'Kundarak: But it looks like even their combined forces were no match for your prowess. Your services are well worth this reward,.

After completing the quest and take the reward, if you talk to him again, he will reply:
 * Barrow d'Kundarak: I have you to thank for keeping House Kundarak's reputation intact.
 * Barrow d'Kundarak: I've even come up with a sales slogan - 'None have broken into the Vault of Night and lived, not even the Great Red Dragon Velah!'
 * Barrow d'Kundarak: We'll have more customers than ever!