Compareable stats to the goblin with a few exceptions. Double or triple dmg to defending or attacking heroes. Favorite target would be heroes and is stealthed from defense buildings until first attack. A nice niche troop.
It would be nice to have troops like that hopefully they add them but maybe have a limit so you can't use a lot of them to reach middle kill hero then attack the base or make them explode like 2 of them would kill a level five hero then not as many people will complain (only a idea)