Joining as Shulk, Heir to the Monado!

[Shulk]

So, I assume this is like Smash Bros where the beam can expand and contract at will? Just to say you should probably include that in the description for others who aren't familiar with it. It will be 600 because it's variable.

" --its metal parts can seamlessly shift and retract, allowing a concentrated burst of blue Ether energy that is five meters long and three meters wide to expand out of the sword, giving the wielder a long reach of attack with virtually none of the clumsiness that weapons with physical blades possess due to the weightlessness of Ether."

"Moves must generally have downsides equivalent to their effects. We generally assume that even weak moves cost some fatigue; for example, swinging a sword or blocking the shield is going to tire you out, that's a given. So, assume that as a move get stronger, the downsides need to be greater in order to compensate. If your character attacks with six times the strength of a normal punch, they'd better have six times the windup, or leave you winded because of how fatiguing it was. Or a combination of both, where you have three times the windup and feel a bit winded. Get it?"

In other words something that damages and debuffs for an entire minute is noticeably stronger than a regular attack, so you need to mention a downside like a charge up time and/or increased fatigue.

This would be 300.

"Because the Monado is using its own energy to sustain a negative effect, the sword's Ether beam is disabled, leaving Shulk to use a weaker, shorter ranged physical blade for the duration of Purge."

"You wouldn't be able to give yourself boosted movement speed without a power up, or burst movement or super speed." The way you describe it here would be an alternate form, where you swap out ATK for SPD. The full description for alternate forms is in transformations; they cost 2000 due to how useful they are in so many situations.

I changed it, but I've changed it to a group buff to better reflect how the Art worked in Xenoblade Chronicles. Let me know if it needs to be balanced more.

How quickly is this casted and are there any downsides to Shulk? If not and if instant/easy it's going to be quite a weak shield especially when used to shield two or three people; it would only be able to take one hit at best.

Would be 600.

"--and upon swinging the Monado, a hexagonal sphere briefly surrounds Shulk and up to two other allies who are nearby."
About one good swing of the blade a good enough start-up time?

"While under the effects of Shield, Shulk and his allies move and attack a quarter less quickly than they normally would."
That downside was already in there, should I modify it?

"The strength of Shield dilutes with a full three people involved, making it unable to hold itself up after more than a single strong attack."