Contingency:
>We don't need senses to act!
>Retreat into the ground (by remembering, based on our orientation, where down was, counting backwards from the time it takes us to emerge. Add an extra second or two for good measure.)
>If our senses do not return, travel, based on our orientation prior to sensory failure, in the direction we remember Sanae's shrine is from our location at top speed.
>If we're already too close to said shrine to get a reasonable distance away, head for where we remember the rough halfway point up the mountain is.
Prime:
>If Contingency is unable to get out of the effect, or once our senses are dulled by around 25%, dissolve Contingency to prevent further contamination.
>Regardless of above:
>>Partition a chibi body off our ourselves inside the ground below our feet and send it off in the direction of youkai mountain.
>>Absorb some of the darkness below our feet to replenish the loss.
Chibi:
>Travel towards Youkai Mountain through the below-ground darkness at top speed.
>Absorb darkness as we travel to both pay for our upkeep and to gain enough mass to shift into small form.
>Emerge, in small form, in front of Sanae's shrine.
>>If that is too close to be a reasonable distance away, then emerge twice as far as where Contingency was.