Frozen Banshee

Swap — The interim poison engine and Urticata's first sub — 6★ but UNBOOKED, which is why she is not a Team Now seat: her A1 only places poisons while a Poison Sensitivity debuff is up, and her own Frost Blight is CD 5 against a 2-turn Sensitivity (books take it to 3). Booked, or seated next to another Sensitivity carrier, she is 2 poisons per turn.

Poison engine / Poison Sensitivity — LEADER AURA — 6★ built — A3 Frost Blight plants 25% Poison Sensitivity, then A1 lands two 80%-chance 5% Poisons per turn off HIS max HP, which is the right damage currency against this HP pool. Aura +35 Ally ACC in all battles is the only live aura on this lineup and is exactly what Stag Knight and her own resistible poisons need.

Swap — Ayumi 5★ (Rare), 6★ built. A3 lays 25% Poison Sensitivity, A1 then spams up to two 5% Poisons per turn — against a 698k-HP stage-20 guardian a full stack with Supreme Kael is the fastest boss kill owned. Needs ~220 ACC (her poisons ARE resistible) and does nothing on the trash waves.

Poisoner (engine) — LEADER — 6★ — A3 Frost Blight lays 25% Poison Sensitivity (CD 5→3 fully booked); A1 hits twice with an 80% chance each of a 5% Poison, but ONLY while Sensitivity is live, so the A3 cooldown books ARE the engine and are the highest-value booking on this team. Two things earlier records missed: her A2 Cruel Exultation fills ALL allies' Turn Meters by 2% per debuff on the target — with the stack running that is a real tempo button — and she now LEADS: her +35 Ally ACC aura in all battles is the team's ACC floor with Gwyndolin benched, which costs 25 aura ACC against Gwyndolin's +60 rather than the full 60. Move the lead to Akemtum's 18% SPD once gear clears every body's ACC target. HH 10/10 Dragon (8/10 hard), Ayumi 5★/4★.

Swap — SEATED — THE poison engine (6★ built): A3 Poison Sensitivity +25% poison damage, then up to 2× 5% max-HP poisons per A1. HH 10/10 Dragon.

Swap — Lost her seat to Supreme Kael. Still a fine 6★ poison body for sub-20 farming and the cheapest +35 ACC all-battles aura on the account, but her engine is conditional and resistible: A3 Frost Blight must land 25% Poison Sensitivity (5-turn CD, 3 booked) before A1 poisons anything, and Numbing Chill's 50% Dec ACC blanks exactly that chain. HH 7/10, Ayumi 3★ normal / 1★ hard, and absent from Ayumilove's Ice Golem tier list.

Swap — Poison-engine boss damage for grind-it-out clears — wrong shape for speed farming.

Swap — Poison depth via Poison Sensitivity, and she is already 6★ — but her whole engine is A1 spam, i.e. direct hits burning the Slumber counter every single turn. Only worth it at stages 1-15 where the counter is 12-16. HH 4/10, Ayumi 2★.