u/Phoenix200420

So I’m planning a campaign that will involve getting a powerful object from Ravnica. My knowledge of the setting is moderate at best, so I figured I’d post on here and pick the brains of those more knowledgeable.

What is the biggest McGuffin of Ravnica? I need to send the party in to pick up a very powerful artifact to help with their quest. I could just make something up but I feel it’d be more fun if it was something from the lore that all the guilds would want to have or keep secret. Something big.

Anyone have any ideas?