Leaderboards and Characters
Leaderboards run in seasons: the game server sends each season's boards, start and end times and rewards, and the Hall of Fame keeps the winners of past seasons. "Leaderboards require an online character and a Steam connection."
Seasons
The Leaderboard panel shows the current season ("Season 1", ...) with its start and end time, its boards, the season rewards and the upcoming leaderboards. Which maps have a board is sent by the game server; the game itself no longer lists them. A board shows the top 10 players and your best, with each player's rank, name and result.
Build lock
On a leaderboard map the build cannot be changed: "Equipment, runes, abilities, talents, Paragon and minions can't be changed on leaderboard maps".
Hall of Fame
The Hall of Fame shows the podium finishers of past seasons, each with rank, class and the season's end date: "One player per tag. Drag to explore; click to view rank history." A player's build can be inspected (level and Paragon), and the panel counts your podium finishes. It needs an online character.
Inspecting a player
Inspecting a player on a board shows the name, hero and result, the hero preview, the equipment slots, the abilities and the runes.