Arach d'Kundarak

Bogwater Tavern
Arach can be seen sit in a reserved table, talking to a red-haired elf woman.

Although this is a foreshadowing for his betrayal on Kundarak, they never leave the tavern, even after you complete the Plane of Night.

Vault of Night

 * Arach d'Kundarak: I am Arach of House Kundarak... it is I who designed this place... and it is I who showed the Aurum how to take it.
 * Arach d'Kundarak: Why, you ask? -- My duty to Eberron superseeded my loyalty to House Kundarak and my dragonmark. It is vital that Velah decipher the mystery of the Dragonshards, or this world is doomed...
 * Arach d'Kundarak: So, are you here to execute me for treason?
 * You: House Kundarak will handle your punishment later. But, you will open the Gate of Night now, or will die!
 * Arach d'Kundarak: Your threats bore me. My knight and his Hounds will put an end to your interference!

After the battle is finished:


 * Arach d'Kundarak: Now that I have seen you fight, I am even more convinced that Lord Barrow sent you to your deaths. If you have such trouble with clockwork contraptions of gears and hedge-wizardry, how can you hope to challenge a creature like Velah?
 * Arach d'Kundarak: I tell you for the last time -- you do not know what you are facing! You should leave this game to those who understand the stakes!
 * You: Open the gate, Arach. I will not rest until I have finished this.
 * Arach d'Kundarak: I will open the gate -- but do not expect to return this way if you fail!