This is not my idea it's one of my friend's, but he wanted me to post this. The pekka tower costs 90,000 dark elixir and
will unleash 3 pekkas to defend your base you will be able to upgrade it 4 times. At lvl 4 it will release 6 pekkas and to make this less OP you should add a lightning sorcerer that is a hero that cost 80,000 dark elixir it will do devastating damage to the tower and the pekkas

