Shiny Colorful Sea Slug Climbs Around Plant

Occurred on September 5, 2018 / Lembeh, Indonesia

Info from Licensor: This is a nudibranch (Doto ussi) with grape-like clusters. It has a mysterious appearance. The sphere shines in the light and it's beautiful. Why does it look like this? This nudibranch was attached to a feather hydroid, which is not a plant but a jellyfish-like creature. If you touch it, it will hurt you. It is probably protecting itself.