The coldain have perfected a new poison to use against the Kromzek. They think. Tests need to be conducted and I've been asked to volunteer the giants of Iceshard Keep for the study. I've been given two versions of the poison to try out, a liquid soluble to go in their supplies and a powder that will be absorbed into the skin of a sleeping giant. I need to be careful not to awaken them. I also need to avoid the Kromzek officers until my sabotage is complete. I understand that if I kill an unauthorized Kromzek or am seen at all, my reward may suffer.
As this zone has similar features for all three missions, we strongly suggest you familiarize yourself with the zone layout. The walkthrough here will be condensed as detailed information is available at the provided link.
Make your way up the ramp, avoiding the wanderer at the top. If you pause a couple of stairs down and scroll all the way out you should be able to watch his movements.
Poison Kromzek food supplies in the Storeroom. These are found in the upper loft. In the northeast corner of the Storeroom is a lift with a glowing switch. Watch out for the wanderer, sometimes he walks close to the lift. Take the lift up to the loft.
Once you're up top click on the crates at -680, 148, 282 , -658, 148, 299 and -659, 148, 282 .
Dust toxic powder on the Kromzek beds without waking up the sleeping Kromzek. To do this you'll need to get to the Barracks via the back hall connecting it to the Armory. In the Armory you should be able to hug the wall behind the forge to make your route to the hallway quicker.
All of the beds in the Barracks are interactable. Work your way around the room by traveling behind the beds and click on all five of them. Clicking on a back corner of a bed seems to be the easiest way. (I'd suggest leaving one of the first beds closet to the doorway/hall till last as when all the bosses go live their aggro range is further then their non-agro spotting range)
DO NOT WALK TOO CLOSE TO THE WEAPON RACKS! If you do, you will awaken a giant and be spotted and attacked. You may have to hug the outside wall to avoid touching the racks.