Within 3 minutes, we reached the area where the 3-leaf should pass before they reach the restricted area.
Most of them were already at that side so, as of right now, this part of the fortress was devoid of people.
We waited for a bit before two Dark Elves appeared from that restricted area. They both looked like they're drained of something as they hobbled back to the direction where their houses were located. Thinking back to the information I gathered, their jobs are the same as that of the Dark Elf girl from earlier. Powering the Dimensional Breacher using their Dark Energy.
Following the two of them, I'm already clutching the Orb of Ailment on my hand. To avoid conflict, using this orb to incapacitate them was proven effective. They're both guys but it doesn't matter now since we will only need their face to enter. After stopping the Dimension Breacher and erasing the trace of the portal, we'll escape the fortress using the Orb of Concealment.