Book Four - "Sybilline Grotto"
Part One - "Cave"
The Sybilline Grotto is south of Lake Avernus. The description is "Deep within the cave of a hundred mouths, there finally is found the Sybil's grotto. The surface world lies back to the north." Instead of going up in the Sybilline Grotto, try going north. Instead of going east in the Sybilline Grotto, try going north. Lake Avernus is outside from the Sybilline Grotto.
The scenery_grotto_2 is scenery in the Sybilline Grotto. The printed name is "cave". The description is "A trapezoidal cave, hacked from the tufa, punctuated with many entrances along its eastern side, runs from its primary entrance to the north far into the hillside to the south." Understand "cave", "grotto", "east", "eastern", "hundred", "mouth", "mouths", "trapezoid", "trapezoidal", "tufa", "hacked", "entrance", and "entrances" as the scenery_grotto_2.