Alright, we have a visual bug with this on the mobile app. When you look at this on the browser, it shows the purple orb and a 1 when you mouse over the new trophy, while the app shows the trophy again by mistake. So as people had guessed in other threads, this is just to show that the fellowship had someone earn at least one point in the Spire. So that 3 means this has been active for the last three Spires, even though it was not showing in the game yet. So for a fellowship that regularly get bronze or better, this is a meaningless trophy.