Angor thoroughly wrote down everything he encountered at Specter Basin in his notebook. In order not to miss any detail, he even blended a trace of nightmare illusion between the letters so that he could rewatch the event later.
He learned such a method from Sunders. It both helped him record information better and allowed him to encrypt something he did not wish others to see. It wasn't complex, but people without the knowledge of nightmare illusions still wouldn't be able to solve the trick easily.
After he dropped his pen, he was still wondering what the crab monster and the giant jellyfish were.
They looked so alike since they both knew how to command undead souls. And the negative energy that they showed probably meant they were undead souls themselves.
Yet nobody had ever heard of undead creatures displaying such intelligence before. Was this another special element exclusive at Specter Basin?