Originally Posted by Drip

The brown one is spawned by Chocolat Cosmos, she might've been in your helpers' squad. She spawns 2-3 of those nodes when the map starts, usually somewhere near the start of the map, so they aren't too effective, but still a nice little extra.

Ah, I actually got her through the serial code promotion. It makes sense, they've been spawning since around the time I added her to my team. Thanks for clarifying!