Hey there. Which step are you on? 'Strangelet Capsules' look like hourglasses. You should have picked one up after fighting the 'Vessel of the Archon' encounter in the first mission - it is on the ground next to the reward chest. It is called 'Unusual Vessel' on the prompt, but does show as 'Strangelet Capsule' once picked up. Later on you will be asked to find two more as part of the main quest. Here you will also be given two other quests, which are what you follow to find the next two Strangelet Capsules - the main quest is progressed by completing these two and obtaining the capsule at the end of each.