Kai Lao is an immidiate 2x attack, but also allows Yamazuki to be used directly after, in the same turn, with the right trait ('Martial Prowess') and with enough energy. It can just be used on it's own though.
Since the4 chaining effect doesn't actually come from either of the attacks it might be easier to simply write
Kai Lao as:
Kai Lao - Energy Cost 2
Deimos attacks her target for twice her Attack.
Unless you're wanting Kai Lao to cause some sort of status effect as well as the double strength hit there's no need for it to be so expensive. I've knocked down the cost to 2 Energy for now unless you'd like to add anything to it.
Since everything in this game is based off of status effects unless it's a direct attack,
Kuchiki Daoshi would be better written as:
Kuchiki Daoshi - Energy Cost 2, target must be Unstable
Hits the target for Deimos's Attack, and inflicts the Stunned status effect for one turn and removes the Unstable status effect. Stunned opponents may not act during their next turn.
As it stand Yamazuki is too powerful, being able to totally nullify an opponent's Defence. There's certain enemies you may be facing (Tanks, Bunkers, falling buildings, etc.) which will have very high Defence as part of the plot, and being able to simply punch straight through them would ruin the gameplay. Instead I'd suggest Yamazuki would work like this:
Yamazuki - Energy Cost 4
Deimos delivers two rapid punches to her target with her standard Attack. The first punch inflicts the Exposed status effect, weakening the target's armour by her Attack rating, which the second attack may then take advantage of. The second punch inflicts the Unstable status effect on the target, reducing both their Attack and Defence by 10% (rounded up.)
Deimos would still get to weaken the armour, and in the case of most opponents would inflict a negative Defence (which would actually
increase the amount of damage they'd take when hit) but wouldn't be able to bash through heavily armoured targets (Bosses) quite as easily. I've also added a scaling effect to the
Unstable effect, to make it work better as Deimos levels up and faces tougher opponents.
With
Martial Prowess you might want to change it so that Deimos could link
any two special moves in the same turn, as long as she has the Energy to do so. This would give you the option of either punching hard with
Kai Lao and following up with
Yamazuki, or the other way around, or hitting with
Yamazuki and following with
Kuchiki Daoshi. Since all these abilities only affect a single target, I'd be happy with Deimos potentially leaving herself exposed to counterattacks from other enemies while ripping a single target apart.
I added that Trait because I thought just being able to punch flying things and knee faceless creatures in the face would be a bit op to just, assume.
I never said attacks would automatically hit, just that Deiomos could try.
It's mostly up to how you write the narrative and how I interpret the events in the round summery which has the effect. If I think Deimos is trying something too OP as part of the action then I'll just cause something adverse to happen to her afterwards. For instance, if Deimos was fighting winged demons on the top of a skyscraper and decided to leap into the air and kick one of them in the head, she might not find herself being able to land back on the roof again, starting the next round plummeting down the side of the building.