Overview
During the Mystical Key main quest in Crimson Desert, players are tasked with entering Hernand Castle. When you first approach the castle gates, the guards will block your path and refuse to let you in, telling you that you cannot just walk into the castle dressed the way you are. The solution does not involve combat or sneaking through an alternate entrance. You simply need to equip the correct outfit.
Quest Context
The Mystical Key quest sends Kliff to Hernand Castle to investigate a lead. The castle is located in the Hernand Town area and is guarded at its main gate. A notification appears in the top-left corner of the screen explaining that certain castle areas require specific outfits for entry.
Step-by-Step Solution
Open your inventory. Pause the game and navigate to your inventory screen.
Find the Hernandian Attire. Look for a purple item called the Hernandian Attire. It resembles a formal coat.
Equip the outfit. Select the Hernandian Attire and equip it on Kliff.
Return to the castle gate. Walk back to the guards at the Hernand Castle entrance.
Enter the castle. The guards will inspect your outfit. Since you are now wearing the proper attire, they will raise the gate and allow you through.
Tips
The Hernandian Attire should already be in your inventory by the time you reach this objective. If you do not see it, check whether an earlier quest step awards it.
No fighting or stealth is required. This is purely a costume check.
After entering the castle, you can switch back to your preferred gear for any combat encounters inside.