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Henry: cast Summon Demon (level 4) and Summon Creature (level 4).
Henry: cast Prismatic Shield (level 5) on self.
Nikta: cast Dual Strike (level 5). If it was disabled, cast Invisibility (level 4) instead, as it's a reasonable choice for critical hits.
Lin: as I understand, she can inspire multiple targets simultaneously. If so, after Henry successfully summons a demon, cast Inspiration (level 4) on Henry (evasion). If unsuccessful, cast Inspiration (level 4) on Zeikin (accuracy).
Araell: cast Healing (level 3) on Henry (assuming the others are at full health).
Zeikin moves 3 squares down.
Joe drinks Rum (level 5).