New dark troop[[ Underground thunder]]

this new troop can sink in the ground and can up on a certain defense for example on mortar. it can be a dark troop.
Hp-320
attack per second - 28
housing space - 8
movement speed - 22
cost- not decided
The main attraction of this troop is its ability to disappear from the base and then suddenly appear near one of the defence item. it can too help players to take out enemies cc troops. if u have any suggestions related to this troop pls feel free to tell. And too pls suggest a name