BERUKA TRUE SOLO!
The key to this strategy is to kill the Thief with Poison strike before he can ever attack. I use the other Thief to build up special charges. After that everything was easy.
Placing Clair on the left side of the map allows me to get the enemy into the right position. I needed to use 2 fliers as filler characters so that they can go into spots that the enemy could not reach.
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