New Dark Spell: Cure Spell
So instead of changing how infernos work, why not just add a new spell that can help with the balancing of these crazy strong towers. I elect this new spell, the cure spell (possible name change).
This spell would be able to heal through the infernos negation, but instead of having a HOT like the normal heal spells, it would be just one quick burst heal. These could be the possible stats.
Unlocks at TH 10 (Maybe TH 9) - 4,500,000 elixir
Lvl 1 - 400 per pulse
Lvl 2 - 550 per pulse (50,000 dark elixir)
Lvl 3 - 700 per pulse (80,000 dark elixir)
I'm not sure what the size of the radius should be for the spell, possibly 5 tiles, just like the heal spell.
These would be great for TH 10 attacks that use troops with higher HP such as golems, the P.E.K.K.A, or valks. Hogs could also be helped with these spells as a lvl 2 could fully heal a pack of hogs.
It could be whiter in color and have a more powerful visual effect, but basically look like the heal spell, maybe with a little animated healer that heals the troops.
Since each dark spell sort of has its own counterpart with the normal spells, this would be the counterpart to, of course, the healing spell. But it does have its own unique way of healing and also helps by possibly adding new strategies to a TH 10's repertoire.