>>543171573
Are you level 60? If not then don't bother with preparations. Just use a support doll from your platoon and she'll do all the job.
Otherwise,
>Sabrina
Applies water tiles for when the enemy isn't weak to water
Counter attacks (which stacks well with Springfield's damage buffs), which lets her deal decent damage. She can dish out around half a million damage throughout the fight if she's decently equipped at full cores.
That's it.
Keys don't do much for her, she's a fortification-reliant doll. Don't bother until she's V5.
>Jiangyu
Applies Defense Down II through key
Another key gives her two more attacks per turn
Her damage is comparable to Sabrina's, but she also shreds through stability.
She benefits the most out of having correct fixed keys among the three.
>Andoris
One key allows her to cleanse the entire team with her ult
Another key allows her to place two turrets in the first turn
This is good utility, you can get these specific cores. But Andoris doesn't deal good damage no matter what, so maxing her out with cores for stat increases can wait
