Sand Assassin, Elemental

Sand Assassin

Medium elemental (air/earth), lawful neutral

Armor Class: 18

Hit Points: 117

Speed: 60 ft , fly: 30 ft , burrow: 60 ft , can hover

STR

15 +2

DEX

19 +4

CON

15 +2

INT

9 -1

WIS

13 +1

CHA

12 +1

Saving Throws: Dex +9

Skills: Sand Form- The sand assassin can move through a space as narrow as 1" without squeezing. In addition can enter a hostile creatures space and stop there. The first time it enters a creatures space that creature must make a DC 14 con save or be blinded for 1 round. Creature can roll again at the end of every turn.
Dispersal - As a bonus action the Sand assassin can disperse or end it's dispersal. While dispersed, the assassin is gargantuan, it's space lightly obscured. Enemies have disadvantage on attack rolls against it. It is indistinguishable from cloud of dust. It cannot make attacks in this form.
Glass - if the sand assassin takes more than 15 fire damage at once, it partially glasses. It's speed reduced by 5 feet for 1 minute.

Damage Resistances: Lightning, bludgeoning, piercing, and slashing from non magical weapons

Damage Immunities: Poison

Condition Immunities: Exhaustion, grapple, paralyzed, petrified, poisoned, prone, restrained, unconscious

Senses: Darkvision 60ft. Tremorsense 60 ft. Passive perception 10

Languages: Auran, Common, Terran

Actions

Multi attack - Two sand claw attacks
Sand Claw - Melee attack weapon +9 to hit / 3d8 damage slashing
If the target does not have any allies within 5 feet of it, the sand swirls around it and attack deals 9 bonus damage.
Assassinate - +12 to hit if the Sand assassin has surprise, During its first turn, the Assassin has advantage on Attack rolls against any creature that hasn't taken a turn. Any hit the Assassin scores against a surprised creature is a critical hit.

A sand assassin resembles an athletic human made entirely of sand. From afar they are easily mistaken for a normal traveler. A good look at it's head reveals no face except for a hollow eye in it's forehead. Sand assassins are bound to guard a stretch of land for eternity or constructed to hunt down a target. Sand assassins will not stop until they are destroyed.