Originally Posted by Rupturez

Kerria does that too :^)
She has no speed but an extra 35% atk power to make that lifesteal count.

Yeah she also works in those Squads especially in Atk Debuff Squads cause she also buffs defense.

Every 6* is good but in the right Squad you can make every 6* amazing.

Fritallaria is another example. You can throw her in any Squad but she really shines in Skill Activation Squads.

Also it's a little bit weird that 6* with AOE Damage considered a higher Tier than Single Target 6* because in (Super) Raidboss Fights Single Target Attackers are overall superior cause they do more damage to one Raidboss. AOE Damage Dealers are better at running Maps because there are more Enemies to defeat.