The Vampire Killer smashes into the skeleton, knocking it to pieces with a single blow.

The two skeletons close by advance into melee with their short swords and attack the wizard.

Meanwhile, near the western edge of the hallway, one advances into the room to attack Chloe, while the other two shoot through the open door at Mustafa with their shortbows.
Spoiler
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Skeletons have vulnerability to bludgeoning damage, so the whip hit for 12+1=13 damage.

S4 short sword vs Cassandra
(1d20+4)[13] for (1d6+2)[5] damage

S6 short sword vs Cassandra
(1d20+4)[13] for (1d6+2)[3] damage

S2 short sword vs Chloe
(1d20+4)[6] for (1d6+2)[5] damage

S3 bow vs Mustafa
(1d20+4)[11] for (1d6+2)[5] damage

S1 bow vs Mustafa
(1d20+4)[8] for (1d6+2)[3] damage


Spoiler: Map
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=>Chloe, Sabian, Vidrik