Marilith

Large, fiend, chaotic evil

CR 16AC 18HP 189 (18d10)

Speed walk 40 ft

str: 18; (+4)
dex: 20; (+5)
con: 20; (+5)
int: 18; (+4)
wis: 16; (+3)
cha: 20; (+5)

Saving Throws CHA +10, CON +10, STR +9, WIS +8

Damage Resistances cold, fire, lightning, bludgeoning, piercing, and slashing from nonmagical weapons

Damage Immunities poison

Condition Immunities Poisoned

Senses truesight: 120 ft., passive_perception: 13

Languages Abyssal, telepathy 120 ft.

Traits

Magic Resistance. The marilith has advantage on saving throws against spells and other magical effects.

Magic Weapons. The marilith's weapon attacks are magical.

Reactive. The marilith can take one reaction on every turn in combat.

Actions

Multiattack. The marilith can make seven attacks: six with its longswords and one with its tail.

Longsword. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) slashing damage.

Tail. Melee Weapon Attack: +9 to hit, reach 10 ft., one creature. Hit: 15 (2d10 + 4) bludgeoning damage. If the target is Medium or smaller, it is grappled (escape DC 19). Until this grapple ends, the target is restrained, the marilith can automatically hit the target with its tail, and the marilith can't make tail attacks against other targets.

Teleport. The marilith magically teleports, along with any equipment it is wearing or carrying, up to 120 feet to an unoccupied space it can see.

Reactions

Parry. The marilith adds 5 to its AC against one melee attack that would hit it. To do so, the marilith must see the attacker and be wielding a melee weapon.