Merry dispels Death Ward and Freedom of Movement, then blinks out. Gothmog flares his fiery wings, leaping forwards and landing just a bit in front of most of the group. He slashes down at Lanius with a longsword crackling with lightning, while the tendrils of his whip try to wrap themselves around Hyra, but both attacks are dodged.
Spoiler
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Balors have Truesight.
Longsword vs Lanius. Attack (1d20+14)[15], (3d8+8)[24] slashing + (3d8)[9] lightning damage. Triples on a crit instead of doubles.
Whip vs Hyra. Attack (1d20+14)[15], (2d6+8)[16] slashing + (3d6)[11] fire damage. DC 20 Str save or pull up to 25' towards the Balor.
Hyra Str save (1d20)[16]+??
=>Hyra, Lanius, Jessica