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Cantergloak suggests you ignore this and make the leap from your vantage point where you stand currently, whilst it is day.
The cliff edge overlooks two bridges over the entrance to the ruined monastery. You would need to essentially leap straight through these bridges, riding the Langkasukan kite sail whilst tethered together. Cantergloak will steer it (you can assist him) but he will be essentially defenceless. Already you can see even in the daytime sunlight that this ruined bridge appears quite heavily guarded (QM: please see the map; the direction of travel of the jump is left to right, you will begin on the farthest left rock ledge).
QM: you can attempt both - first investigate the cave now, then make the leap past the ruined monastery in the night, but this will reduce your visibility and make the jump more dangerous. There is in fact no guarantee that the bridge will become less well guarded at night, though you suspect this might be the case. (QM: I will roll, and the probability will be tilted in your favour for reduced guards)
Or you can ignore the cave at the mountain peak, follow Cantergloak's advice attempting the ruined monastery bridge leap during the day right now, and brave the Stranded Sons cult guards that you see before you. (QM: this will not occur immediately, I will position you on the battlemap first and you can plan or prepare accordingly etc). Attempting this jump in the day reduces its difficulty.
If you attempt the leap off the mountain, there is no returning back to explore the cave with the mysterious axe blade.
