ShiroKuro

ShiroKuro is the third Raid boss of Blue Archive. The fight consists of two stages, one versus Shiro and one versus Kuro.

Shiro will throw bombs at your students in unpredictable and often destructive manner, while Kuro will line up teacups against your students in a predictable, but equally destructive manner. Success in ShiroKuro may require players to utilise various tools of survivability through the means of self-repositioning (Izuna, Asuna), repositioning via pick-ups (Serina, Fuuka, Kotori), or utilisation of cover/summons (Shizuko, Shimiko, Utaha, Hifumi).

Additional Notes:
It should be noted that in extreme difficulty, the required amount of damage to fill the groggy gauge is higher than the boss's HP, meaning it is impossible to stun them with this condition. Shiro will attempt to aim at least one bomb on a student, with the rest being randomly (?) placed. A student can be hit by and bounced between multiple bombs. Once launched, the skill will only damage the first student it hits before disappearing. If the skill spawns on top of a student already occupying that position, the student will take damage and be knocked back, but the skill will not disappear and still launch as normal. The attack patterns appear in a fixed order, and will be reset to the first pattern after recovering from groggy.
 * The time limit for this fight is 4 minutes
 * All of the bosses EX skills have a knockback effect. No damage or knockback will occur if students are not standing in the skills area of effect.
 * The groggy gauge will accumulate under the following conditions:
 * The bosses are hit by Mystic type damage
 * When Shiro's ball is bounced back after failing to destroy cover generated by the likes of Shizuko or Shimiko
 * When Kuro hits herself with her own skill
 * When the bosses are stunned, "Rolling roll!" and "Charge!!!" will be cancelled, but "Dokkaan!!" will not be cancelled.
 * As the ATG increases, not only does the damage for "Rolling roll!" increase, but also the number of bombs generated and their explosion range.
 * Shiro uses "Rolling roll!" at fixed times.
 * Kuro uses "Charge!!!" about every 15 seconds