Since the Dark Spell Factory is Confirmed...
I think there should be a teleportation spell that allows you to drop troops within its vicinity. There should be a maximum amount of troops you are able to drop, 20 or 25 seems adequate, you shouldn't be able to drop an entire army right on top of a players townhall.
The spell should be a high tier dark spell, perhaps level 3 or 4 dark spell factory, and it would be the dark counterpart to the jump spell.
12000 DE per level 1 teleportation spell. 50000 DE to upgrade it to level 2. Level increases the amount of troops that can be teleported, and increase the longevity of the spell.
I look forward to your feedback, and other ideas about dark spells.
Caodown