Merry's summoned hand misses, as does Lanius's sword-stroke. Jessica strikes a telling blow, and Hyra's god honors her wishes by turning her into a dragon for one minute.
Nearly surrounded, he lashes out at Jessica repeatedly, finally stunning her before moving away.
Spoiler
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5 attacks, any that hit get a stun attempt, DC 22.
Attack until stunned, Jessica, then Hyra, then Merry, then Lanius. Movement will depend on stuns.
Attack (1d20+14)[16] for (1d10+7)[8]
Con save (1d20)[7]
Attack (1d20+14)[22] for (1d10+7)[11]
Con save (1d20)[16]
Attack (1d20+14)[21] for (2d10+7)[16]
Con save (1d20)[4]
Attack (1d20+14)[20] for (1d10+7)[16]
Con save (1d20)[8]
Attack (1d20+14)[27] for (1d10+7)[15]
Con save (1d20)[5]
5 attacks, only 2 hits, second hit stuns
=>Party