Dryndock did. And frankly, they murdered the battlefield.

Face me and see the true power of the night!

The night is nothing compared to the dark, for the dark is why people fear the night

What is the dark without the night, for the night brings with it darkness, and darknesses delivers fear into the hearts of ponies.

But the dark can exist in places other than the night, thus the former is not wholly dependent on the latter. But without the dark, the night fails to strike it's well known fear. Thus, the latter is dependent on the former.

The night brings the moon which turns the oceans like a witch with her stew pot. Darkness fears the moon for the moon emits light; a true symbol of hope in rough times. The night does not fear the moon like the darkness, for it embraces it rather than running away from it. The darkness is a true coward, fearful of an object with such grace and gentle kindness.

Your darkness may prevail in daylight hours, but it is a coward, fearful of the light.

The darkness retreats when it is weak, so that it can come back in full force later.
It is not cowardice, merely waiting until the time is right.

'Tis only an excuse for shuch cowardice.
Of course the darkness will need to "rebuild its strength" for such cowardice behavior involves running. Given time, one will develope fatigue from running. like hunted and hunter, forever they run until the prey's stamina reserves run dry. Then fatigue takes over, and the hunter prevails. Hunters are keen, they strike when the moment is right, just like the night. The darkness however, stikes as if it were blind. Scattered across the globe are patches of darkness in its reckless behavior. And even here, its cowardice shows for does it once leave the comfort of a cave except at night? Does it move from the hidden corners it finds when there is no night? Instead it waits for night to bring it salvation. For night ends the day, pushing at the sun until the sun can no longer be seen. What does the darkness do but provide fear? It waits for the night in fear of the light.

You can't beat me for I am...

What? I don't even.

You obviously have not witnessed true darkness. When true darkness draws it's shroud upon you, it becomes a part of you. Then, not even the light, nor Harmony can save you, for only your mind can be your salvation. Fight it within you, or you will be truly broken, a perfect vessel for Death to command. You are not true darkness. The Nightmare Force is not true darkness. Beware Hresvelgr. For it is growing within the most promising of the Children of the Elementals. His trial awaits. Your fate rests on his willpower.

I take it you are saying darkness attacks from within. While this may be a proven tactic, it is still a cowardice one. As the darkness does this, so do nightmares. Nightmares too become a part of you, but they are not cowards like darkness. Nightmares are the children of the night. Nightmares haunt your dreams, as well as come back during the day, forever persistent. Nightmare's deliver fear, enough in some cases to diminish a mans sanity enough to kill. Ghost, spirits, and demons may lurk in the dark, but they attack as nightmares. Nightmares feed off of the fears of others. If even the smallest sliver of fear is present, nightmares will be there, ready to claim their next victim. So watch you back, nightmares attack randomly, and it could be you whom they come after next.