How to open Skibor's Safe
If you already found the safe, in the room with Zarik, you are probably looking for the code. I don't blame you, it's not so easy to find. With the safe behind you, reach the other side of the room, on a shelf you will find an audio log. To be able to pick it up you really need to stand exactly in front of it, like in this picture:
Listen to the audio log and report to Zarik, he will tell you the missing numbers.
The code to open the safe
If you really are in a hurry, then the code is 2314: you will find some Cleric's clothing inside. In any case, you will have a little surprise later when you report to Irissa.