Unlike your hero, captains may be levelled up in a vaster variety of ways:

  • You can attack any monster squad (except for Rare and Heroic ones).

  • You can attack other players.

  • You can explore crypts - the higher the crypt level, the more experience you gain.

  • You can use special experience chests purchased in limited offers.

The most efficient ways are attacking monster squads or other players.