This thing is called a lobe tree. They don't usually sing. This one does in a room in Fetid Glen. Fetid Glen is a region which has rot by default, even before being marked as rotten on the map in the shelter. They're even often spotted seen around the rot in other rotten regions and in Outer Rim.
They have a black dripping effect associated with them. Just like:
The brain trees from the Kickstarter. Wer didn't get much of these, and a false one was placed in Downpour but was made of metal. Which doesn't seem fitting with the original description:
Something significant? Dripping? Dripping and strange lumpy trees, something never before associated with the rot, now popping up all around it? And with the rot becoming SENTIENT and learning to SPEAK, with having Lobe trees. As in your frontal lobe, your language processing center. This shit seems so important
