Sunny salvaged some food from the destroyed fridge, had a very late supper, and went down to the basement again, this time to travel to the Chained Isles.
By then, all shadow essence he had spent during the duels and to keep the Mantle of the Underworld from turning back to stone had already been restored.
Wearing the onyx armor required a constant flow of essence to maintain the [Feather of Truth] enchantment active — if Sunny wanted to keep its weight sufficiently light, at least — and with the Soul Serpent assuming its weapon form, Sunny couldn't use the Shadow to keep the expenditure to a minimum. Wearing the Mantle for prolonged periods of time was rather draining... however, it was also a perfect way to train himself on how to manage essence most efficiently. He had no complaints.
...It was funny, though, that the Dreamscape required a person to expend real essence despite being just an illusion.
'Oh well.'