Tsuki upon returning towards a hideout amongst the swamp hut next to the Black Fifity Night in the Shadow Swamp, in which he was with the most striking and immediate impression a visitor to the Crawling Dimension from the depths of the shadows would experience was the lack of color and light; no sun, moon, or stars adorned the ink-black vault of the sky, and all things seemed as if the color had faded, leaving nothing but black and white.
Being that in the twilight they were more like "dark black" and "light black, with a light source only illuminating half the distance it normally would, flames and fires gave off less heat, where spells dealing with light or fire were less predictable." and prone to failure, while shadow spells were improved.