True agony is having to choose which character to delete in Black Desert when the new Musa and Maehwa classes come out because you’ve already used all of your slots. Luckily for players, Daum is halving that pain by granting a free bonus character slot to everyone. This gift will bring the total slots available (before purchase of extras) to five. In addition, the character limitation per server is being bumped from nine to 10. So get ready to go forth and enjoy one of those new classes! Of course, if you want to try both, you are on your own for that second slot.
Source: Official forums; thanks to kalamari for the tip!