Aiona [Timeless] is the core damage dealer for this team, unleashing basic attacks that can hit multiple enemies once she uses her Ultimate.
Bella [Fleeting] is a single-target buffer that greatly increases the damage output of the one she possesses. Not only that, she is also capable of healing allies, albeit it's only for one ally with the lowest health.
Acappella is another support that offers Bloodsoul Recovery, increasing her value as it helps create faster blood moon rotations. She also offers decent buffs and minor healing.
Quinn is the main tank for this team, mainly for sponging attacks as she can regenerate thanks to Scar of Crowley. Not only that she can also apply Parasol Shelter, which negates fatal damage, ultimately cheating death.
Bella will be the secondary tank and another bloodsoul generator if you have a LVL 5 Silvershadow Chronometer. Her puppets can also help mitigate some of the damage, but not for a very long time.
Pretty much the current best team for Tower of Purification, as they are just stages like Campaign, so this team is an easy recommendation.
This team consists of Double Tank/Frontline with Bella and Quinn, which is great for stalling. With the help of Quinn's cheat death mechanic, you can generate enough bloodsoul to do an entire bloodmoon rotation.