New Elemental-Update

When Supercell introduced the Inferno Tower and TH 10, they described it as a "Fiery Update"
How about a new elemental update?
It would be a mix of water, ice, fire, air....and other things.
First of all:
When inferno towers are close to becoming depleted, they stop firing every 3 seconds, and if in charge mode, they restart at 50% of the previous amount of damage.
Then, when it's completely depleted, it fires a huge fireball on itself, destroying the tower and counting towards the attackers percentage, but the blast has a radius of 6 tiles and deals 65 damage (same as level 8 mortar)
New Defenses
Volcano: A rocky, fiery mortar, dealing lots of damage (high level mortar) and also leaves some fire behind. Plus, no blind spot!
Level 1 (Normal volcano appearance)
Blast: 45 damage
Flame: Left behind for 5 seconds, dealing 7 damage per second
Hitpoints: 750
Cost: 1,800,000 gold
TH 9
Level 2 (Volcano looks less rocky, but bigger, and it has some rather crooked stairs)
Blast: 60 damage
Flame: Left behind for 5 seconds, dealing 9 damage per second
Hiptoints: 900
Cost: 4,000,000 gold
TH 9

Mountain
It can only be placed between walls, as a more powerful substitute. Troops always go for this (unless there is an opening) except for wallbreakers and walls. It is a new type of wall that is extremely durable, but has some weaknesses.
Hitpoints: 3500
Double damage is dealt by wizards.

Finally....Dragon level 5
Stats are not decided, will be commented/edited later. I just wanted to introduce the function: It's armor is conductive, in a good way. It fires, well, fire, but if the hidden tesla attacks it....then it suddenly fires lightning in 3 directions, with high damage but poor aim! Basically a lightning spell in the mouth of a dragon!
Speaking of hidden tesla, it needs a BIT of a buff.