A sealed abandoned practice room behind the ambush corridor containing fifteen unidentified monsters that killed every attempted clearing party.
The room lies beyond a normal wooden door at the end of Astrid's secret transit corridor. A dusty paper sign from management warns entrants of extreme, painful death.
The Night Wyrm says nobody has identified the fifteen red-tagged occupants. Multiple teams attempted to clear the former guild arena, and all died.
Roughly fifty security devices cover the approach, including crawler and monster alarms, Demon Snares, and traps that summon specific guards. The final door itself has only an ordinary hanging padlock.
Carl and Katia consider releasing the creatures to trigger Astrid's Cosmic Sense but reject the uncontrolled quest hook. Carl instead fortifies the door against blast damage from the assassination.
A rusted padlocked door with a dusty fatal-danger sign, fifteen red map dots motionless behind it.
The arena is an uncontrolled adjacent threat that could turn the precise ambush into a catastrophe.