In Destiny 2 The Final Shape a new exotic quest can now be unlocked called Dual Destiny. The Destiny 2 Dual Destiny Exotic Quest will now allow you to unlock an Exotic Class Item for your Hunter, ...

Ergo Sum is an Exotic sword in Destiny 2, added in The Final Shape expansion. This is not only the sword you saw on your grave back in the Corridors of Time — giving it some major lore significance — ...