Never thought I would get to a chapter 10,wel as this is my first MLP story,its gone kind of well,thanks for the review Phoenix King!.Hope you enjoy it:).
Now the elements of harmoney can be used as lethal(hurt something or as a duel weapon).Non letheal.(How the cartoon portays it)Or the WMD version where it is similar to a 6nuclear missle cluster where it annihilates mostly everything. However only the two princesses can use it(together)and Luna was a bit reluctent...

FORTRESS NATION OF ALRA-5th day of siege:Elements of Harmoney.

The rainbow coloured beam bit its way through the atmosphere at over 2300 mph, it came down from space but a small but powerful shield spell was formed to stop it from a unknown spell was powerful but it couldnt stop the most powerful weapon in existance.

The elements first liqudated the air around them,freezing anything moving before causing the said objects to combust silently. Next game the tallest objects,buildings,sky scrapers and low flying Pegasus and dragons were turned to gigantic artillary of the REM paled in comparision of what was happening.

The next stage of the WMD was to seperate into six different "drills".Where the drills bored down into the surface before connecting. The titanic underground connection blasted upwards creating a huge mushroom cloud that was visable from Equestria. Most things by then had already blew up,turned to dust or was simply squshed like a bug when something heavy is dropped on it.

The shockwave then comepetly elimated anything alive within 150km,plants, and everything was completly destroyed. The crater was still expanding downwards,leaving a hole in the planet.

But...there were survivors.

Princess Cadence+Shining armour:Canterlot private tower.
"I dont believe it..."Cadence whispered,she had been looking out of the tower at the elements of harmoney as they were launched by the princess...and now she could see where they went. The mushroom cloud was visable,even on a non sunny day like today.
"Celestias gone over the line...but I cant order her about and I think Lunas done this aswell".Her husband joined her and commentated.
"Agreed the only pony with enough force and authority to stand up to Celestia would be the military chief,Silver sabre and since he went in that direction...my god".Cadence realised what Celestia had just done. She had killed the military and Silver sabre,so that no one could order her about.

"I think we better talk to them".Shining armour remakarked,putting on a serious face and donning his uniform."Ill come with you!".His wife darted after the captain of the royal guard.

Princesses Celestia and Luna...:Canterlot royal tower.
"Nice job sis,now you need to be "rewarded".Celestia grinned to herself after seeing her work and justice to her rule being done. Now the world was under her control,Silver sabre was gone for good and his powerful military Luna...she had conjured the spell with her older sister but...it didnt feel as powerful,it was ovbious that Luna didnt like it. But Celestia knew how to punish her little sister.
"What reward,dont tell me its going to be another crappy games console".Luna remarked,knowing that Celestias "rewards"were usually childish pranks.

But using the elements like that...to murder and kill hundreads of thousands and possibily Luna the guilt would never go away,to Celestia it was everyday. Well it happened,Silver sabre was dead and his army Luna,he was didnt get why he was hated,maybe it was becuase he was a Pegacorn like her,but nobody had ever called HER a mutant. Anyway,like his sister,Silver sabre was good looking,he had displayed a sense of humor that she liked and he always tried to make a his jokes made her laugh.

"Now for your reward!".Celestia shouted,bringing Luna out of her thoughts,the bigger sister hadnt have anything in a box for her "reward". It was confusing,until the bigger pony touched her horn.
"What are you doing?".Luna remakred,feeling a electrical sensesation,her horn was a fetish,something that she had previously touched now and again for the pleasureable sense that she got from rubbing it.
"No NO NO NO!"She screamed as Celestia giggely rubbed her horn faster and faster,she got hotter and hotter and started to moan in pleasure. Apparently Celestia had known that this was her younger sisters weakpoint.

The purple pony fell on the floor and began to moan and scream uncontrollably as Celestia kept rubbbing it faster and faster. "STOPPPP!"She screamed before her body went into climax and Luna had her first non priavte orgasm. All the meanwhile the older sister laughed uncontrollably.

Princess Cadence+Shining armour:Canterlot royal tower.

The two ponies made they way up the tall stairs that led up to the royal armour,his face grim ordered the guards to move or "suffer the counsequences". Cadence followed behind,her hoofs making no sound as she trotted along.
"Whats that?"She asked as the pair climbed the stairs. She sniffed the air and then beulched. "Smells like...something".Shining armour preffered not to ask what it smelt like,he already knew that it was for the bed and know was NOT the time.

They looked at each other."Race you to the top".Cadence winked in a playful manner and procceded to gallop up the stairs giggeling like a excited filly. "Right behind you!".Her husband felt like it was a good time to improve his mood so he chased her up the stairs. Im thankful my wife is such a nice person,beautiful,caring and such a good pony.
He felt lucky really,to be married to a princess. Unfortunatly the thinking was enough to let Cadence to take the lead and by the time he got up the stairs,she was already wiggeling her back playfully at him like she had won the nobel pony prize. "I win I win I win I win!".His wife giggeled.

"Yeah you win,now let me have a look at that door".Shining armour crept over to the door which led to the princesses room. Peeking through a crack he saw something that should never be seen again.
"Honey,come here".He instructed,holding out a hoof. Cadence obeyed and trotted up to her husband."What is it?...what,hey thats for another time!".She shrieked as he rubbed her horn.

Cadence didnt move firstly but after 20seconds she had to break off as the eletrically sexual,pleasurable tingle became too much. In return she nuged Shining armour and whispered in his ear seductivley."We can do this afterwards if you want,alone in our room".
He grinned but geastured her to have a look through the crack.
Cadence gasped,inside was Celestia rubbing Lunas horn,the poor pony in question was awake but unable to much otherwise than moan as she became more and more pleasured,but it really hurt judging by the look of pain in her defeated eyes.
"I think Celestias gone nuts...".