Prowler Golem and Tring Nacra

Prowler Golem

Large construct, unaligned

Armor Class: 15

Hit Points: 172

Speed: 45 ft , fly: 30 ft , can hover

STR

18 +4

DEX

21 +5

CON

19 +4

INT

4 -3

WIS

11 +0

CHA

0 -5

Saving Throws: DEX +9, CON +9, STR +7

Skills: Immutable Form. The golem is immune to any spell or effect that would alter its form.
Magic Resistance. The golem has advantage on saving throws against spells and other magical effects.
Magic Weapons. The golem's weapon attacks are magical.

Damage Immunities: Poison, Psychic; Bludgeoning, Piercing, and Slashing From Nonmagical Attacks That Aren't Adamantine

Condition Immunities: Charmed, Exhaustion, Frightened, Paralyzed, Petrified, Poisoned

Senses: Darkvision 120 Ft., passive Perception 10

Languages: Understands The Languages Of Its Creator But Can't Speak

Caustic Spray 
The golem spits a jet of powerful acid from it's jaws in a 30-foot line that is 5 feet wide. Each creature in that line must make a DC 18 Dexterity saving throw, taking 3d8 acid damage on a failed save, or half as much damage on a successful one.
Limited Flight - 
The Golem can use it's wings to hover or fly at 30 ft per round.  The Golem can only do this for 3 rounds before it must land and recharge due to it's weight. 

Actions

Multiattack 2X Attacks:
Claw: Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 13 (2d6 + 6) slashing damage.

Mental characteristics

Personal history

Tring Nacra is a gnome from the Fletching who was exiled after many unsolved murders kept happening near him.  No one could prove his guilt in any of these but rumors swirled.  Eventually the city detectives made him a deal.  Leave and never come back or suffer a strange accident of his own.