People would always be on guard against a salesman who suddenly visited, or a friendly helper who arrived unexpectedly. This was all the more so in a place like the Chaos Abyss.
But while the enemy of an enemy might not be a friend, there was the possibility of becoming allies.
And so, I "coincidentally" met with a Bloodspear lizardmen scout team right in front of the dark dwarves' fortress. Then, I had a major fight and killed off two entire squadrons of lizardmen. After that, the dark dwarves welcomed me in.
Of course, the main reason why I had been able to enter so easily was probably due to the dark dwarf who kept hopping up and down on the fortress wall while pointing at me.
"Master, Master, we can't understand the martial arts manual that you sold us."
The moment I walked through the gate of the dark dwarves' fortress, the rash dark dwarf from before came looking for me. It seemed that he had a rather high status in this tribe.