One of the main quests in Destiny 2: Shadowkeep requires you to find various essences, and then purify them by performing certain actions or finding items. One such item is the Aetheric Charms, which are required to cleanse the Essence of Greed. As a reward you will receive the legendary machine gun "Reliable Monument".
To find the item, you need to travel to the Temple of the Mole next to the Anchor of Light, which is near Eris Morn and the Sanctuary Landing Zone. Just head to the location marked with the circle in the screenshot above.
Once inside, just go ahead and destroy any enemies in your path (or go around them). Once you get to the room in the screenshot above, go to the place with the arrow to find Sharma.
Please note that in order to receive the reward, you will need to complete two more tasks: go through various tests (patrolling, public events, Lost Sectors on the Moon) and kill 50 enemies with a machine gun.
