Unicron and Thunderwing reveal themselves

This is how The Lord of Skull Spiders steals Starlight Glimmer's soul goes in Adventures in Camp Everfree.

Starlight Glimmer: [after getting separated from Sharpshot, Kickback, Hardshell, Princess Celestia, Princess Luna, Optimus Prime, Arcee, Bulkhead, Bumblebee, Smokescreen, Ratchet, Megatron, and Sunset Shimmer]