Fate
Tsuna Feesh

Yes, it will grow in power until it is a 4-winged Ex Core, at which point it will still continue to gather Ex Force. When an Ex Core is finally collected, all the Ex Force that was being drawn to the Ex Core will also be added to the character's Ex Gauge. Hope that helps.

The Ex Core always starts out as a 1-winged bell. However, as it gathers Ex Force, it changes into a 2-winged bell, and finally a 4-winged bell. The position of the Ex Core is determined by your Luck versus the opponent's Luck. If your luck is highly, when it appears, it will be closer to your position.

That's called an Ex Core... Actually, let's talk Ex in general.

Your Ex Gauge, when filled, allows you to go Ex Mode. However, to GET to Ex Mode, you must collect what is known as Ex Force, those little lights that appear when you strike your opponent. As you gather them, your gauge will fill. Occasionally, Ex Cores appear, little bells with wings. The number of wings determines their power. 1 Wing will only boost your Ex Gauge a little, 2 wings can fill more than half, and 4 wings will instantly fill the gauge. So, it's important to try and get this item. Note, that while an Ex Core is out, all Ex Force that is knocked out of opponents will be drawn to the Ex Core.

Check this one out!
YouTube - Dissidia - Cheater gets pwned

Haha, expert OK player!

Let's see... Ah, here's an interesting match-up...
YouTube - Dissidia: Final Fantasy Onion Knight vs Zidane

No, I finsihed my current task, but I'll probably get dragged outside again soon, so...

Of course, and he barely even gets touched!

And time for MORE Trivia! Yayzles!

There are severeal numbers on the screen. These are your Bravery total. The higher your Bravery, the more damage you'll deal with an HP attack. Build your BP by using the O button to chain and drain your opponent's BP. There is a middle number known as the Bravery Pool. Whenever the opponent's, or your, BP is in Break status, the entire Bravery Pool is added to the other character.

BTW, I'll talk later. WEEDS!

I can't say anything, you gotta do it for yourself and SEE! On another note, check out this total OK Ownage!
YouTube - Onion Knight (lv. 74) VS Jecht (lv. 74) FF: Dissidia

Not really. Ex Burst is a concentrated, unblockable attack. The only thing you can do against it is increase your Defense using O.

Well, if you've seen videos you know that Holy is just one attack, where as Shuriken is many. In the US version, appearently, Holy is a single, powerful attack, where as Shuriken is many, weakers attacks. It seems they wanted to balance it out.

Hmm... Well, if you played FF III, you'll know that selecting magic, you have to scroll around to find what you need. You use your eyes to see what you want, and then select it. That is the same case here, except you have only a few seconds to do so.

For Ninjutstu, you must select Throw, and choose the Shuriken. Once again, it is shuffled randomly, and you must look for it.

As for Zidane... well, I can't say much until there's an English exhibition of him...

Onion Knight has two Ex Modes, Ninja and Sage. Depending on what he preforms during Ex Mode will determine what job he's in. Using physical attacks will change him to Ninja, and using magic like Flare and Firaga, he will change to Sage... There are two Ex Bursts: Spellbook and Ninjustu(haven't seen an English Ninja Ex Bursts, so I'm calling it this). For Spellbook, you must select magic from the command menu, and the find Holy. The spells are randomly organized, so you'll always have to look around.

More Dissidia trivia!

Gabranth, outside of Ex Mode, has NO HP Attacks. The only way he can deal damage is during a Chase Sequence. Instead, the square button activates what is known as Ex Charge. This will slowly fill his Ex Gauge, but leaves him completely vulnerable to attack. However, when he enters Ex Mode... his moveset changes completely. You've seen some battles? Yes, he gains a plethora of new moves, most which are for homing on the opponent.