This page/section contains known information about a future update to the game. The content discussed here is not yet in the game.
“It's like a Skeleton party in the sky, until all the balloons pop... then it's a Skeleton party on the ground!”
The Skeleton Barrel card will be unlocked from Builders Workshop (Arena 6). The Skeleton Barrel is a flying, building-targeting troop that drops a group of skeletons once it is destroyed or reaches a building, similar to the Battle Ram. A Skeleton Barrel card costs 3 Elixir to deploy. It appears to be a black, spiked barrel tied to several team-colored balloons. The barrel has a white painted skull on the front of it.
The Skeleton Barrel was playable in the Mirror Challenge on 17/10/17, before its release date, as a glitch. Supercell fixed this glitch with a maintenance break.