So, you've completed The Final Shape campaign, had that rather terrifying (but hopeful) confrontation with the Witness, and now you want the sword you're going to die with. Allow me to explain how to get the Ergro Sum exotic sword in Destiny 2 The Final Shape.

Step one is to beat the main campaign if you haven't already, because you can't start the quest to unlock Ergo Sum, 'Destined Heroes' until you've done that. Talk to Ghost and he'll give you the quest. There are nine steps in total, but don't worry, it won't take that long.

First, you’ll be asked to listen to a message coming in on the radio right next to Ghost, which will reveal that our old frenemy Savathûn isn’t quite done bashing my head off yet. Listen to the message, then head out to complete your first mission on the chain, Queens, Part 1. (The marker for this won’t be far from the radio you received the message on.)

I'll give some brief instructions for this mission, because there are a few mechanics in it that really confused me when I first played the mission myself.