Adrian is now in his true form that is made of the nether mist itself. He is also like a spiritual being due to the unique composition of the nether mist which is why the Sacred Snake thought he was the blind demon god. Gods tend to be spiritual in nature and do not have a complete physical form in the mortal realm.
He also summoned all his soulbounds in their Nether Forms. All of his soulbounds became ghostly monsters that resembled him. The newest editions would be Dodu and Kimat as this is the first time that they are transformed into the nether forms.
Dodu looked like an amalgamation of three different storm clouds that moved in a liquid motion. Dodu's core became a light source inside his body that glowed in a reddish gray light. The Predator Slime also became as big as Adrian's current form that is almost as big as Kanlaon.