Multiattack

The dau makes two Slam attacks.

Slam

Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 6 (1d6 + 3) bludgeoning damage plus 10 (3d6) necrotic damage, and the dau regains hp equal to the necrotic damage dealt. The target must succeed on a DC 13 Constitution saving throw or its hp maximum is reduced by an amount equal to the necrotic damage dealt. This reduction lasts until the creature finishes a long rest. The creature dies if this effect reduces its hp maximum to 0.

Spellcasting

The dau casts one of the following spells, requiring no material components and using Charisma as the spellcasting ability (spell save DC 13): At will: detect thoughts, minor illusion 3/day each: invisibility, major image 1/day each: programmed illusion, project image