Blade of the Apocalypse

[b]Name: Blade of the Apocalypse
Type: Greatsword (Artifact weapon)
Description:

Spoiler:

A titanic black blade whose weight is unknown because no mere man could wield the sword. The swords has a length of 30 ft. It is an ancient artifact that has been forged by the gods to defend the world against the prophesied dragon of the apocalypse, Acnologia. It is said that this weapon was used when Acnologia was wounded. But for the blade to be used, the user must also wield the force of The End.
Strengths: A massive sword that has a huge amount of destructive power that can crush practically anything. And with its length, it can cause havoc in long distances, making it perfect for all around strikes and AoE damage. It also slightly amplifies all the effects of "Power of Apocalypse". Despite the sword's physical appearance, the sword is easy to wield. Swinging it is easy like a normal sword because of the lineage active. Defenses are easily crushed and deflect any projectile spells and because of the sword's huge size, it can also be used as a shield to block incoming attacks. The sword also gives additional dark damage to attacks.

Weaknesses: The sword has a duration of when it can be used. Only those who has a Power of Apocalypse lineage may use the sword. Therefore, the sword can only be used if Power of Apocalypse is active (2 posts). And once the lineage's duration has expired, the blade can no longer be used. As stated earlier, the sword amplifies all effects of the lineage, even the cost of having a shorter life span. Meaning continuous usage of the sword would lead to an even sooner death than expected from using the lineage without the sword. Also, with the sword's large size, it affects a great area all around the user while he is swinging it making it prone to hurting allies. The sword also drains a great amount of power. Using the lineage plus the sword will exhaust the user, and when the blade's ability is used it will make the user faint after use.
Abilities:
Increased "Power of Apocalypse" lineage effects
Decreases life span

Name of Technique : Apocalyptic wave
Description: The caster will charge all of his energy to the sword to send a large black wave of destruction to the target that explodes upon impact. The wave will obliterate anything in its path until it reaches the targeted location. The wave's range is 200 ft and a blast radius of 100 meters.
Strengths: A wave that deals massive dark damage and will penetrate any kind of armor except for high ranking light element armor.
Weaknesses: Will shorten user's life span and drain him of all his energy making him exhausted. If the target also has a Power of Apocalypse lineage active, the target will not be affected, only its surroundings.
Cooldown: It can only be used once in a thread. Will leave the user greatly exhausted. 2 Threads must pass before it can be safely used again. However, the ability can be used in the next thread if the user wants to die from using it.

Bump

You need a Cool down on the ability.
You need to label the duration instead of being so vague about it and having it rely on others. Just add in the duration in parenthesis after explaining it.
You need every strength and weakness you can think of about the blade, its swing length, its swing speed, so on so forth, you also need to have all of the strengths like everything the sword does good for you, which there is more than what you lab

Edited, Night.

There is a difference between a Sword and a Great sword. Great swords are huge and heavy, there is no easy way to swing them about. Normally requiring two hands unless you have godly strength, even then they are slow to attack with but devastating for attack. You label the AoE attack radius, sense that is what they are made for, basically all around strike rather than focused. Yet I do not see that in your strengths.

a fifty foot range wave with a 300+ foot explosion radius...I am sorry does that work well? That would hurt you, all your allies, and every neutral creature in the area, and so on. HUGE WEAKNESS THERE and a bit too unsteady. Reduce that blast radius please so that you are not just causing the worlds greatest amount of "Friendly and Self-Fire."

"Can only be used once." Soooo if it can only be used once why does the blade not shatter? You do not say it can only be used once in a thread, or it takes a few threads to cool down, you just say for a duration that it can only be used once.....So what happens to the blade, does it shatter with so much power leaving it?Explain and add the correct term to this definition.

Bump when edited.

BUMP! After so long, I was finally able to edit this. Also my character is capable of using such a large greatsword because he will have the Power of Apocalypse lineage active when he uses this.

Ok, I can see this done. At last it seems balance for it's natural over powere ability. Approved.