Rewards for this quest can vary dependent upon how many mobs you end up killing throughout the quest.
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.
Step on the portal behind Bas to zone into the solo instance Iceshard Keep: Agent Provocateur. Everything in this zone sees through sneak and invisibility.
Poison Kromzek food supplies in the storeroom.
Head up the stairs into the keep. There is one giant that patrols back and forth at the top of the stairs so wait for it to be out of aggro range.
Take a hard left (east) and near the corner is a room. This is the storeroom.
One giant patrols the storeroom. Cut across diagonally when you can by heading northeast. You'll be by the lift.
Click the switch on the lift (southwestern pillar) to bring it down and get on. Keep an eye on the patrolling giant, sometimes he walks nearby!
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.
Go back out into the Great Hall, make a tight right turn and head to the western room opposite of the room you were just in.
Be careful before entering this room! The wanderer in here will walk right up to the opening. Once you're sure it's safe beeline southwest and hug the wall behind the forge.
At the southwestern corner of the room there will be a path going south. This leads to the barracks.
All of the beds in here are interactable. Work your way around the room and click on 5 of them.
DO NOT WALK TOO CLOSE TO THE BEDS! If you do, you will awaken a giant and decrease your rewards.
We suggest hugging the outside wall to do this and to click the beds from as far away as possible.