From his years of exploration throughout the many planes, Cieba was familiar with this subtype of plane. Size-differentiated planes were actually quite common, and more often than not were harmless.
However, this was a largely subjective experience, since the denizens of the many planes differed as much in size as they did in shape and appearance.
Cieba slowly swung the Treasure Frond back and forth through the air, holding the image of the fugitive who had stolen the mage's artifact strong in his mind.
The Treasure Frond had been passed down from his family through the generations, each generation having prayed over the frond for the predecessor and ancestors to imbue it with their power.
And when Cieba had announced he was becoming a Freeman, the Frond had been passed to him, so that he would return with great treasures and fortune for his family.
The spatial treasures the mage had offered as reward were exactly what he needed to power his pebble enough to return home.