Medium undead, neutral evil

Armor Class: 14

Hit Points: 83 (15d8+15)

Speed: 30 ft , swim: 45 ft

STR

17 +3

DEX

16 +3

CON

12 +1

INT

13 +1

WIS

14 +2

CHA

18 +4

Skills: Athletics +6 1d20+6 Deception +7 1d20+7 Stealth +7 1d20+7

Damage Resistances: Poison; Bludgeoning, Piercing, and Slashing from nonmagical, nonsilvered attacks

Damage Immunities: Necrotic

Condition Immunities: Charmed, Frightened, Poisoned

Senses: Darkvision 60 ft., passive Perception 12

Languages: Common, Dwarven

Challenge Rating: 6 ( 2300 XP)

Proficiency Bonus: +3

Actions

Charm. One humanoid the rusalka can see within 60 feet must succeed on a DC 15 Wisdom saving throw or be magically charmed for 1 day. The charmed creature obeys the rusalka's verbal or telepathic commands. If the target suffers any harm it can repeat the saving throw, ending the effect on a success. Once the effect ends, a creature is immune to the rusalka's Charm for the next 24 hours.   The rusalka cannot have more than one charmed target at a time. If it charms another, the effect on the previous target ends.   Tresses. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 13 (3d6+3) bludgeoning damage, and the target is grappled (escape DC 16) and pulled 10 feet towards the rusalka. Until this grapple ends, the target is restrained, the rusalka tries to drown it, and the rusalka can't use its tresses on another target.   Tickle. The target grappled by the rusalka must succeed a DC 14 Constitution saving throw or be incapacitated with laughter for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on a success.

Lair Actions

On initiative count 20 (losing initiative ties), the rusalka can take a lair action to cause one of the following magical effects, but cannot use the same effect two rounds in a row.  

• The body of water in which the rusalka resides surges outward in a grasping tide. Any creature on the ground within 10 feet of such a pool must succeed a DC 15 Strength saving throw or be pulled 10 feet into the water and knocked prone.
• The rusalka shifts the opacity of all water within 100 feet into a thick murk. The affected murky waters are heavily obscured for until the next initiative count 20. The rusalka ignores the obscuring effect of the murk.
• The rusalka animates 1d2 skeletons of dead victims that were drowned in her lair. The skeletons last for 1 minute or until the rusalka is killed. The skeleton(s) appear in an unoccupied space within the body of water and obey the rusalka's commands.

Bound to their own watery graves, rusalki use the body of water where they died as their lair, whether it be a lake, river, pond, or creek.

Regional Effects

Distorted by the rusalka's unnatural presence, the area within 1 mile of their bound body of water might exhibit one or more of the following effects:  

• An illusory duplicate of the rusalka appears in random places at random times. An illusory duplicate has no substance, but it looks, sounds, and moves like the enchanted appearance of the rusalka. Shortly after the illusory duplicate is sighted, it will move out of view towards trees or other natural phenomena and vanish as soon as it breaks line of sight. It always moves towards the rusalka's lair.
• Dead fish might frequently wash up on shorelines, only to be quickly torn apart by wandering wildlife such as wolves, freshwater crayfish, or saltwater crabs (depending on the lair).
• Water tastes faintly of copper and appears slightly murky, regardless of where of where it is harvested from.