Thanks to a new update to ENDLESS Dungeon, Heroes are now unlocked in multiplayer co-op.

• If the host did not have the hero unlocked yet, all players in the squad will unlock this hero together when the conditions are met and the host talks to the character in the saloon
  
  
• If the host had already unlocked the hero, you can unlock it yourself by playing as the hero and either:
  -Reaching the end of the first floor
  -Completing the first quest step of the hero

Check out this video guide by Hazmy:

In ENDLESS Dungeon, content unlocked during an online co-op game varies depending on if you're hosting the game or joining it.

Here is an overview on how the system works:

• ENDLESS Dungeon Wiki[endlessdungeon.wiki.gg]
  
• ENDLESS Dungeon Official Discord[discord.com]
  
• ENDLESS Dungeon on Games2Gether[community.amplitude-studios.com]
  
• ENDLESS Dungeon Official FAQ[community.amplitude-studios.com]
  
• ENDLESS Dungeon PC Hotfixes[community.amplitude-studios.com]