Kahn and Celine passed through the final door that emitted blinding white light when it opened after Celine used her blood.
The last key was the Imperial bloodline and if not for her being present here… Kahn would've never been able to overcome this final hurdle.
Behind them, all his subordinates and the hostage aka Ezekiel followed without making a sound.
Finally… Kahn and Celine passed through the white fog-like light and saw the new surroundings that they both knew was coming based on the experience from the previous two doors.
But after they saw the scenery… both of them were left speechless on the spot.
A vast and flourishing land with luscious greenery. And in the middle of it… was a ginormous castle that was the biggest construction Kahn had seen in his new life yet.
Imperial Castle Reference Art in chapter comments. Check it out.