Multiattack

The spider thief makes two sickle claw attacks.

Sickle Claw

Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 10 (2d8 + 1) slashing damage.

Razor Line (Recharge 5-6)

Melee Weapon Attack: +3 to hit, reach 15 ft., one target. Hit: 3 (1d4 + 1) slashing damage, and the target is grappled (escape DC 10). Instead of moving, the spider thief can retract the razor line and pull itself onto the grappled creature (the spider thief enters and remains in the target's space). The spider thief's sickle claw attacks have advantage against a grappled creature in the same space. If the grappled creature escapes, the spider thief immediately displaces into an unoccupied space within 5 feet.