Boss Encounter 18 - lvl 5 to 10

1x Infernal Gargoyle Large fiend , chaotic evil
Armor Class 19 (Natural Armor) Hit Points (17d10 + 119) Speed 30 ft., fly 60 ft.
STR 22 (+6) DEX 12 (+1) CON 24 (+7) INT 7 (-2) WIS 17 (+3) CHA 16 (+3)
Saving Throws STR +10, WIS +7, CHA +7 Skills Perception +11 Damage Resistances Fire, Cold, Poison; Bludgeoning, Piercing, and Slashing from Nonmagical Attacks that aren't Silvered Damage Immunities Poison Condition Immunities Exhaustion, Petrified, Poisoned Senses Darkvision 60 ft., Passive Perception 10 Languages Infernal, Telepathy 120 ft., Terran Challenge 12 (8,400 XP) Proficiency Bonus +4
False Appearance. While the gargoyle remains motionless, it is indistinguishable from an inanimate statue.
Devil's Sight. Magical darkness doesn't impede the gargoyle's darkvision.
Magic Resistance. The gargoyle has advantage on saving throws against spells and other magical effects.
Actions Multiattack. The gargoyle makes two attacks: one with its horns and one with its claws. It can use Hurl Flame in place of any melee attack.
Horn. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: (2d8 + 6) piercing damage and (2d6) fire damage.
Claws. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: (2d8 + 6) slashing damage.
Hurl Flame. Ranged Spell Attack: +7 to hit, range 150 ft., one target. Hit: (4d6) fire damage. If the target is a flammable object that isn't being worn or carried, it also catches fire.