Note this is only during transformation for nightmare.

Pov: you told nightmare you were going to poison Tommy not realizing nightmare is currently Tommy's secret protector (no one knows about this except the opposites)

Just so you know they're meant to be gray spikes in his hair. This also isn't meant to look edgy or seem edgy and just is meant to show the transformation that will occur, dreamon turning into his dreamon form looks a bit different (just so you know while I was writing this sentence I realized I forgot the spines on his back so I quickly went and made them a thing

The only ones he's really told about this are goodboyhalo and napsap. No one else knows about this