The area is used as living quarters for a Lizardfolk Shaman and his 2 close adepts (the third was eaten by
the dragon). He came with the excuse of having seen
the dragon as an unknowing agent of his god/ess(?) in visions, and that he was fated to serve him. (Actually he didn't end up serving often except through magical healing... but see
Note2)
After completly ignoring the Lizard's racketing and chewing on one of his subordinates, the
Madman Shaman yelled
"Consume me body if is your wish!";
the dragon felt not so much as curious as throughly amused about these words, his ego was strongly pumped up: he just
liked being venerated... even if it was by some lousy lizardfolk.
Of course there was also some material convenience in not eating the "rightful blessed servant", availability of magical healing is much appreciated by anyone. So he was allowed to take up residence with his two -remaining- close subordinates. Quite a bit of time has passed, but the shaman still venerates
the dragon as a living aspect of his god's will.
Will yell at anyone coming in :
"You coming to venerate the Great One's will?!!"
Note: The Dragon = Either "mommy" or the strongest of those here, depending on wether "mommy" ends up existing or not.
Note2: If the Dragon has some Lizardfolk servants outside the cave, this is their spiritual leader. If not, well... the dragon wasted a opportunity of getting free followers.
Note3: Actually this could work for an area other than 12
Note4: Shaman (Lizardfolk Middle Aged Clr 7, CR 7), Adepts (Lizardfolk Adpt 5/Rng 1, CR 5)... What do you think, a CR 7 and 2 CRs 5 fit well in this pseudo-Communitary-Dungeon?