New group challenges will soon be available in Might and Magic Heroes Online. In just a couple of weeks, players will gain access to so-called Party Raids. These special tasks are designed for characters that have reached level 30 and require five players.
Playing through the browser game will slowly introduce you to the new quests. You don’t have to jump into these raids right away, though - returning to them at a later date is always possible, especially if you have to gather friends or replenish your troops first. Whenever you are ready to take on the challenge, all you have to do is head back to the province and look for the respective portal.
Source: Official game homepage