Yukiko's Bankai Techniques

For: bankai
Name: Andromeda - アンドロメダ - Andromeda
Type: passive*
Cooldown: n/a
Cost: low
Range: long
Description: A powered up version of Milky Way. The particles move around like sparkling purple dust which is then hurled towards the target, may it be the opponent or any target desired by Yukiko. Unlike other zanpakuto, Nagareboshi does not possess cutting ability in her released form. Instead it focuses on blunt concussive force. It has the power to create as simple as concussions and contusions up to something as breaking bones or bludgeoning someone to death**. The damage will depend on the gap between the target's HAN and Yukiko's SEI.

0-2 - Moderate Damage - Concussions, Contusions and Fractures
3-5 - Major Damage - Dismemberment; the blunt trauma is strong enough that it can cause removal of an extremity or tearing off of flesh from the body in itself.
6-up - Severe Damage - Instant Death***

For: Bankai
Name: Ōrora - オーロラ - Aurora Borealis Mark 2
Type: defensive
Cooldown: 4 posts
Cost: medium
Range: short
Description: A powered up version of Aurora Borealis. The most basic of Yukiko's shikai defensive techniques is the ability to condense and therefore make a hardened yet translucent purple wall around her. This barrier has the power to reduce or completely block off an attack depending on the gap between Yukiko's SEI and the enemy's HAK. The effect differs depending on which side she focuses the shield on and if her SEI is higher than the opponent's HAK.

One Side
0-2 - Moderate Reduction - decreases the damage by two notches lower of the intended damage.
3-5 - Major Reduction - decreases the damage by three notches lower than the intended damage
6-up - Complete blockage of damage

Multiple Sides
0-2 - Minor Reduction
3-5 - Moderate Reduction
6-up - Major Reduction

If the enemy's HAK is higher than her SEI then the barrier is rendered useless and will be shattered like glass. The barrier remains active for 3 posts but can also receive only 3 attacks. If in the span of 3 posts, no attack is received, then the barrier is then nullified.

For: bankai
Name: Chōshinsei - 超新星 - Supernova
Type: offensive
Cooldown: 3 posts
Cost: medium
Range: long
Description: A powered up version of Nebula. The stardust floats around Yukiko as it becomes charged with her reiatsu. It loses it's blunt concussive force in exchange for explosions. It surrounds the enemy like sparkling lights and in a snap of her fingers, the sparkling lights detonate one by one. The extent of damage changes depending on the difference of Yukiko's and the target's SEI. The technique can also be cancelled if the target's REI is higher than Yukiko's by 5 and above.

For: shikai
Name: Bigguban - ビッグバン - Big Bang
Type: offensive
Cooldown: 5 posts
Cost: high
Range: medium
Description: A more powered up version of Apocalypse. Considered as Yukiko's ultimate bankai technique, she infuses a higher amount of reiatsu into her dusts as compensation for it to gain a cutting edge. The dusts float all around her as she prepares her technique and with a wave of her hand unleashes a focused cross slash towards the enemy. She can also diffuse the release of the energy and release three ring shaped energy which can wreak havoc on weaker enemies.

Notes:
* - passive in the sense that it is her shikai's form and not really a technique per se. Imagine Byakuya's Senbonzakura
** & *** - death of course needs permission to owners of the characters. Otherwise, if it were NPC'd and the character meets the criteria, then that's that.
**** - yup, her bankai is basically a power up of her shikai.