Introduction
Kachina is the brand new 4 star character that we all can obtain for free from Natlan Archon Quest series, released in 5.0. At the first glance, Kachina doesn't have much unique or strong aspects that will improve your teams or add more damage by herself. She's a pretty standart, weak-sided free 4 star character. Even so, she has the unique Natlan trait: Nightsoul mechanics. Thanks to her being a Natlanian, she can access Nightsoul mechanics and abuse the new extremely strong artifact set.
Scroll of the Hero of Cinder City
This artifact 4-set bonus makes it's wearer to give bonus elemental damage up to %40 with Nightsoul's Blessing state requirement. Kachina is one of the only and best abusers of this set, because she has a Geo vision. That means; double element/double geo hypercarries, mono geo teams and Chiori/Albedo double geo teams etc. will have enormous team-wide elemental damage bonus.
To compare this set, Let's look at Furina's Elemental Burst's damage boost value: At talent level 9, Let the People Rejoice! gives all teammates %69 damage boost. Which requires special Fanfare mechanic special to Furina herself. At C0 Furina, most teams even with team-wide healers will have some downtime for the maximum amount of damage bonus, so you'll approximately benefit from %50 damage bonus if we are being generous. This set gives two different element bearers %40 element bonus with high uptime with only one condition: triggering a reaction. Which is the very core mechanic of the game so it's not even a condition at this point. All future Natlanian supports or even sub-dps characters will want to use this set to maximize team-wide damage for sure.
Teams
Summary
Kachina is NOT a good character by herself.
But thanks to the new artifact set, she can be used in a lot of team compositions and for some of them; she improves a lot of existing team comps. Have fun using her!