This is lvl7 WB. All statistic are same as lvl6 but...
you can connect it other minimum lvl 4 ground troop
it is invisible until you activeted it (like heros ability)
example: you connect your HWB to golem. That you need to decide before attack. You start attack with few barb and archers. Maybe giant and regular wall breakers. Then two golem. Your hidden wall breaker is always in first deployed troop. Giant and regular WB's make little hole in defence and golem follow. When giants are destroyed lonely golem banging wall. Golem are terrible wall breakers but then you active your hidden WB and make way directly to enemys TH. Now send wizard for at least two star!
good troop to connect with: giant, pekka, golem. Remember it have to be lvl4!

