I'm not sure how this will measure up, never tried rhyme-writing before in my life, but I feel I must at least try. Don't read this as a one-piece story, it's not. Rather, it's a complitation of miniature stories.
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The Elements
One soul destructively burns with Fire,
Agile and feral, with cunning desire.
Mystical force empowers this beast,
Pain is no meaning, to it's victims at least...

A foreign warrior emerged, and he was stronger than they all,
He used his might to bring them death, he striked them down without a flaw.
He left destruction in his path, Earth gave him power to control.
The terror halted back that day, but it would never turn it's row.

When worlds collide, there is no place,
To try and make a futile race.
There is one way to stay alive,
Use Water powers to survive.

It was your choice to be restrained
By wretched laws of your embrace.
You should have vanished into Air,
While I was giving you the chance.

All four together they unite,
To sever evil from this space.
Power of Nature is the might,
Of every being, of any place.

If I was younger thousand years,
Your strikes would make me feel their size.
But sadly Darkness is the case,
So you can kill, but I won't die.

There comes a time when one must choose:
Become a legend, or a fiend.
This is no choice, but hardly truth:
Light is the way of rigid guard.

By my command, your soul is done,
And only one can spare your lie.
Grim Reaper answers to no man,
But Death can call him to comply.

Three Powers of the Mind as one
bring horror to the villian's stand,
A fight against them is renown,
A fight to devastate the land.

Defiled by the ways of sport,
A marksman comes to cheat for old.
But Chaos never rests in veins,
And no technique is quite too bold.

Remembering the ways of past,
An Order sentinel steps up,
He may not be the choice of last,
But he can close the deadly gap.

A second is the time he needs,
To strike a foe so very hard,
The Lightning covers vicious deeds,
But it can not remain denied.

It's hardly and excuse to run
When Powers of the Spirit rise.
If you were having vile fun,
Prepare to meet your short demise.
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I believe I should explain what this is all about, just in case:
10 elements, divided into 3 power groups. That's how I see it. Each element has it's own strengths and weaknesses.

Fire:
+ extreme speed
- endurance

Earth:
+ can absorb huge ammounts of damage and distribute the absorbed energy among allies
- cannot use the energy himself unless in attack mode, and cannot absord damage unless in defense mode

Water:
+ he can both bend water directly (including freezing/boiling and shaping) or inflict physical damage
- can do little damage alone

Air:
+ extreme stealth, has the ability to shape-shift
- limited attack abilities

Darkness:
+ nearly limitless regeneration abilities
- has no proper defenses

Light:
+ great perception
- mental attack resistance

Death:
+ incredible magic skills
- pretty vulnurable

Chaos:
+ causes big explosions of energy with every shot, immune to his own magic
- can hardly be healed if suffered damage

Order:
+ great knowlege, gets only stronger if hit by Chaos magic
- under right conditions may be extremely vulnurable to Chaos magic

Lightning:
+ limitless energy capacity, severe attack speed
- the more he's charged, the more vulnurable he gets

There, that should do it. It's a very basic breakdown, but it's enough to understand the story.
Any questions?