1:10
Those guys are dropping souls of light. Are they in the Hallow Biome, or is that the alternative?
Also, if it isn't the Hallow Biome, then early in the video it shows similarly themed enemies to the monsters in that biome. Would this mean that the Hallow and the alternative would be in prehardmode? The stuff in that biome looks very similar to the granite from earlier spoilers. This would fit with the Roman (or Greek) theme with the enemies. Ancient Rome used colored granite for buildings, though they only used pink and grey granite. Maybe this could also
suggest that there will be an underground Desert because these blocks look like they may be some sort of Granite Sand. The crystals in the background could be there because granite is made up of crystals.
This is very convoluted and could just be the underground Granite minibiome, but I've already written all of this out.