“Short for 'alternate'. [Alt] refers to the alternate character a player has from their main character”.1)

You are not expected to require a set of end-game characters in DnL2)

Dark & Light does not follow conventional MMO game design.

SnailGames do not see “problems” associated with alts in some games (such as ArchAge) where they can be used to make a player self-sufficient and wealthy. Prior to launching Dark and Light Early Access, Associate Producer Horsejoke said of alts: “I believe the plans are to only allow one character per server - multi-boxing shouldn't actually be possible (or viable, rather) unless a player is using some crazy advanced FPS bot that probably doesn't exist”.3)

Whilst multiboxing may have some perceivable use (scouts; house seal swapping in sieges etc), it would appear that multiboxing in Dark and Light is not a problem currently.