Nothing like a good old mystery to unfold, especially if it is a new Destiny 2 Exotic weapon. Here is how to get the Ergo Sum Exotic sword in Destiny 2.Destiny 2: How to get Ergo Sum Exotic SwordOne of the many Exotic weapons that The Final Shape introduced in the game is the Ergo Sum sword. However, this one is particularly mysterious given the little information provided by Bungie. However, thanks to our friends at light.gg, we can determine that you will need to complete an Exotic quest named “Destined Heroes” to get it. This has a total of 9 steps, so check them out below:Step 1: There’s a strange radio transmission coming from the old Tower in the Lost City… and it’s using a Hive frequency.Step 2: Investigate the activity of Savathûn’s Lucent Hive near the portal.Step 3: Speak to Micah-10 through her conduit in the Arbor of Light.Step 4: Talk to Cayde-6 in the Lost City.Step 5: Ghost has something he wants to talk to yo…