One thing I should point out, you can save anywhere in King Sombra's path, and the timer doesn't reset. Also, it may be a coincidence, but apparently when Rainbow Dash is fighting alone, she gets nothing from the friendship meter, or at least I got nothing both times the meter filled. (Also named "King Sombra (undead)")
Rainbow Dash's Passive Abilities mostly consist of speed bonus's. With how much they've been raised here, she's able to get 5 turns before Sombra gets one when he's slowed. One of her Passive Abilities gives 24% more evasion as well.
Spell dodge allows her to reflect spells such as sleep 20% of the time while Quick Dash gives 10% more counterattack rate. When counter activates, the user also avoids all damage.
Superior Acceleration allows Rainbow Dash to get 2 turns in one, 20% of the time. However, completing a combo will cancel her second turn, and can't activate during the second turn.
As for Rainbow Dash's attacks, most is pretty obvious. The not so obvious being Guard, Reinforce, and Hyper Strike. Hyper strike is basically a defense ignoring physical attack that never misses. Guard allows her to absorb physical attacks, which is important for avoiding all that counterattack damage. Reinforce allows Rainbow to summon the 3 elements, Fire, Ice, and Lightning into her own element. This makes her resist those elements and attack with those elements. Having those elements also increases her damage slightly, but if the enemy is weak to some of those elements, the damage increases by a lot more depending on how many.
Now about the setup, I came across something odd with Twilight. Usually when Twilight falls anywhere in the game, it's either game over, or use up a Soul Lock. The Soul Lock wasn't used when I was setting up. I think it has something to do with the Arena because you don't get a game over if you lose in it, and it may have been carried over with the rest of the game, at least in Twilight's case.
King Sombra's only Gimmick seems to be that Berserker Aura he gives himself when at less than around 15% hp. King Sombra isn't the hardest boss in the game, (in my opinion) but he is also the only arena boss you can really set up a solo fight with him. (Unless you're using Twilight to solo.) This is because as long as Twilight is down, you can't access her Utilities. As such, you can't access the arena unless you revive Twilight.
Anyway, this is the last video I have left to show about this game. I might show more when part 2 comes out. But it will be in Hardcore Mode.
Btw, yes, that last bit of the video, that name came from Doctor Whooves & Assistant. I did that as a joke because, in this beta, Twilight has so many in battle lines. I didn't actually save that name.
Download Link: http://www.darkkyshadow.com/Download.html