With the oozes neutralized, it becomes apparent that the outer wall of the acolyte barracks area has collapsed some time in the last few years. There is now a hole in the side of the Horn, which could possibly be exploited as a way inside, bypassing the designed defenses.
In any case, the first two levels of the Horn appear to have been swept and secured. You still have no way up to the third level without climbing over the front of the mountain, but you do know that at least one of the pillars in here is hollow, and likely runs through at least the floor below.
What do you do?
"Not trusting me might be the smartest decision you made since getting off of your horse."
Kharal Zhou, Fire Aspect of Lookshy: