u/Tough-Lack-2256

I was playing on my world, and I'd just hatched 2 dragons into the Primordial Hellscape biome, and I went to go build something, and when I started, I got 2 messages saying that my dragons had been converted. Lo and behold, they are now elite parasites, did anyone else know about this? I would think it would be mentioned somewhere but this is the first I've known anything about it.