To Hunt an Assassin

To Hunt an Assassin is a side quest in Book II. It is started when the character picks up the Soulpiercer arrow from Darus's body in Western Kessian Basin.

Journal entry
"You have decided to find the assassin who killed Darus. The only clue you have is the arrow found at the murder scene - a unique creation called a Soulpiercer. Find the person who makes these Soulpiercer arrows and you'll have found Darus' assassin."

Walkthrough
Make your way to Port Kuudad then locate the entrance to the city's sewer system, which is inside a small building south of the city gate. Descend down the stairs into Port Kuudad Sewers then immediately turn right and follow the path to a locked door. It can either be picked or opened with the Jade Key, which can be found on a body in another part of the sewers.

After gaining entrance, continue to make your way to a room with four chests. Above each chest is a plaque with a description of an object, which can be decoded to be, from left to right, a Lock Pick, a Bag of Salt, a Small Candle and a pair of Quill and Inkwell. Put these items into the appropriate chests then pull the nearby lever to reveal a flight of stairs in the middle of the room. Descend down the stairs into Thieves' Arcadia.

Make your way through the arcadia to the room at the very end where a non-hostile assassin can be found, who introduces himself as Zeblin. Upon being confronted about the Soulpiercer arrow, he admits to being its creator and the assassin behind Darus's death. However, he then expresses appreciation that the character was able to make it this far into the arcadia and find him, and offers training in rogue skills if the character gives up trying to kill him.

If you choose to accept Zeblin's offer, this quest will be abandoned and he will become a trainer on Hide in Shadows, Move Silently and Pick Locks. If you choose to refuse his offer he will turn hostile. Kill him to complete the quest.

Rewards

 * 2,000 XP

Trivia

 * There is no shortcut from Zeblin's location back to the sewers, which means the character has to go all the way through the arcadia again to return to him. Therefore if you intend to accept training from him, it's recommended to prepare the sufficient amount of gold for it beforehand to avoid having to repeatedly make the long trips. Alternatively, you can use the Portal spell to access him instantly.