Normally Black Desert Online players get four character slots per server with their purchase, but this isn't going to be the case anymore starting on April 20th.

Starting on Wednesday, as mentioned on the official forums, the limit will go up by one, to five, with the maximum expansion (via cash shop) growing to 10.

This is to allow players to try at least one of the new classes (the sword/bow wielding Musa and Maehwa) without having to delete a character or to buy a new character slot.