|Quest Giver||Oleander Sinclair|
Oleander Sinclair has requested that I help him acquire a Minor Alchemist's Art potion that will enable him to remain skilled in alchemy. He suggested that I search nearby Shieldring Keep . Oleander has been banned from the keep on account that he's a criminal.
The potion is in an unlocked chest in the keep, but taking items from it is a criminal act. Duck and wait until the patrolling guard has fully depleted his "awareness" meter of you before you take the item.
If you are looking for the item, tracking the quest will reveal it; barring that, it is the unlocked chest in the northeast spur of the keep. Get the potion back to Oleander to complete the mission.
Another way to get the potion is to make it yourself. The ingredients for it are one Sky Blossom and one Embereyes. You can find these reagents anywhere around the quest giver, but if you collect early on you should have them in your inventory by now.