Large Monstrosity (Shapechanger), Neutral
Armor Class 15 (natural armor)
Hit Points 157 (15d10 + 52)
Speed 15 ft.
STR
18 (+4)
DEX
12 (+1)
CON
16 (+3)
INT
5 (-3)
WIS
14 (+2)
CHA
18 (+4)
Saving Throws CON +7, CHA +8
Skills Stealth +6
Damage Immunities Acid
Condition Immunities Blinded, Charmed, Poisoned, Prone
Senses Darkvision 60 ft., Passive Perception 16
Languages --
Challenge 10 (5,900 XP)
Proficiency Bonus +4

Captivating Display. Any humanoid creature within 50ft and in line of sight of the Slot Machine Mimic must make a DC 15 Wisdom save. On a failed save the creature is compelled to move within 5ft of the mimic and loses 5d6 gold before suffering Bite attack from the Mimic.

Stacking Bonuses. The Slot Machine Mimic's critical hit range increases by 1 per every round spent in combat.

Shapechanger. The mimic can use its action to polymorph into an object or back into its true, amorphous form. Its statistics are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.

Adhesive (Object Form Only). The mimic adheres to anything that touches it. A Huge or smaller creature adhered to the mimic is also grappled by it (escape DC 13). Ability checks made to escape this grapple have disadvantage.

False Appearance (Object Form Only). While the mimic remains motionless, it is indistinguishable from an ordinary object.

Grappler. The mimic has advantage on attack rolls against any creature grappled by it.

Jackpot. Upon defeat the mimic explodes, raining down 15d8! (add any rolls of 8 to the total and then reroll them, repeat this process until there are no rolls of 8) gold coins in addition to any gold taken from other creatures this encounter.

Actions

Multiplay.  The mimic may make any one melee attack in addition to a Payout attack as its standard attack action.

Pseudopod. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit:  1d8 + 5 bludgeoning damage. If the mimic is in object form, the target is subjected to its Adhesive trait.

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit:  1d8 + 5 piercing damage plus 1d10 acid damage.

Payout. The Mimic launches a coin the target with great force. RangedWeapon Attack: +7 to hit, range 60ft./120ft. one target. Hit: 1d10+5 bludgeoning damage.

Reactions

Flashing Lights.  Whenever The Slot Machine Mimic suffers damage it may use it's reaction to fire one ray at random at any target it can see within 80ft.

1. Charm Ray. The targeted creature must succeed on a DC 16 Wisdom saving throw or be charmed by the mimic for 1 hour, or until the mimic harms the creature.

2. Paralyzing Ray. The targeted creature must succeed on a DC 16 Constitution saving throw or be paralyzed for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. 

3. Disintegration Ray. If the target is a creature, it must succeed on a DC 16 Dexterity saving throw or take 5d8 force damage. If this damage reduces the creature to 0 hit
points, its body becomes a pile of fine gray dust. If the target is a Large or smaller non magical object or creation of magical force, it is disintegrated without a saving throw. If the target is a Huge or larger object or creation of magical force, this ray disintegrates a 10-foot cube of it.

4. Death Ray. The targeted creature must succeed on a DC 16 Dexterity saving throw or take 5d10 necrotic damage. The target dies if the ray reduces it to 0 hit points.

Legendary Actions

Feature Triggered. The mimic may activate its Flashing Lights reaction as a free action at the end of another creature's turn. The target of the attack suffers disadvantage. (3 uses per encounter)

Description

It's a big flashy slot machine. It's also a mimic.

Monster Tags: Shapechanger

Environment: UnderdarkUrban

Giostrus