I brute forced this challenge. I don't really know what the mechanics are either, except that:
a) The first 3 turns determines the order Sensui will use his skills in.
- 1 skill is AoE.
- 1 skill is single target with 2 range (surround him, or have Landius as your tank and counterattack).
- 1 skill is a stun attack (have Yggdrasil wreath or sage's hat affect your tank).
For me, the skill order was: stun, 2 range, AoE.
b) Sensui teleports around randomly, so a high mobility party is preferred. Maybe something like Landius, Leon, Luna, Altemuller. then Tiaris and Liana.
c) the more turns pass, the longer Sensui's range, so killing him asap!
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