Encounter 12 - lvl 5 to 10

1x Incubus Medium fiend (shapechanger) , neutral evil
Armor Class 15 (Natural Armor) Hit Points (12d8 + 12) Speed 30 ft., fly 60 ft.
STR 8 (-1) DEX 17 (+3) CON 13 (+1) INT 15 (+2) WIS 12 (+1) CHA 20 (+5)
Skills Deception +9, Insight +5, Perception +5, Persuasion +9, Stealth +7 Damage Resistances Cold, Lightning, Poison; Bludgeoning, Piercing, and Slashing from Nonmagical Attacks Senses Darkvision 60 ft., Passive Perception 15 Languages Abyssal, Common, Infernal, Telepathy 60 ft. Challenge 4 (1,100 XP) Proficiency Bonus +2
Telepathic Bond. The fiend ignores the range restriction on its telepathy when communicating with a creature it has charmed. The two don't even need to be on the same plane of existence.
Shapechanger. The fiend can use its action to polymorph into a Small or Medium humanoid, or back into its true form. Without wings, the fiend loses its flying speed. Other than its size and speed, 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.
Actions Claw (Fiend Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: (1d6 + 3) slashing damage.
Charm. One humanoid the fiend can see within 30 feet of it must succeed on a DC 15 Wisdom saving throw or be magically charmed for 1 day. The charmed target obeys the fiend's verbal or telepathic commands. If the target suffers any harm or receives a suicidal command, it can repeat the saving throw, ending the effect on a success. If the target successfully saves against the effect, or if the effect on it ends, the target is immune to this fiend's Charm for the next 24 hours.
The fiend can have only one target charmed at a time. If it charms another, the effect on the previous target ends.
Draining Kiss. The fiend kisses a creature charmed by it or a willing creature. The target must make a DC 15 Constitution saving throw against this magic, taking (5d6 + 5) psychic damage on a failed save, or half as much damage on a successful one. The target's hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.
Etherealness. The fiend magically enters the Ethereal Plane from the Material Plane, or vice versa.
1x Lamia Large monstrosity , chaotic evil
Armor Class 13 (Natural Armor) Hit Points (13d10 + 26) Speed 30 ft.
STR 16 (+3) DEX 13 (+1) CON 15 (+2) INT 14 (+2) WIS 15 (+2) CHA 16 (+3)
Skills Deception +7, Insight +4, Stealth +3 Senses Darkvision 60 ft., Passive Perception 12 Languages Abyssal, Common Challenge 4 (1,100 XP) Proficiency Bonus +2
Innate Spellcasting. The lamia's innate spellcasting ability is Charisma (spell save DC 13). It can innately cast the following spells, requiring no material components.
At will: disguise self (any humanoid form), major image
3/day each: charm person, mirror image, scrying, suggestion
1/day: geas
Actions Multiattack. The lamia makes two attacks: one with its claws and one with its dagger or Intoxicating Touch.
Claws. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: (2d10 + 3) slashing damage.
Dagger. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: (1d4 + 3) piercing damage.
Intoxicating Touch. Melee Spell Attack: +5 to hit, reach 5 ft., one creature. Hit: The target is magically cursed for 1 hour. Until the curse ends, the target has disadvantage on Wisdom saving throws and all ability checks.
1x Succubus Medium fiend (shapechanger) , neutral evil
Armor Class 15 (Natural Armor) Hit Points (12d8 + 12) Speed 30 ft., fly 60 ft.
STR 8 (-1) DEX 17 (+3) CON 13 (+1) INT 15 (+2) WIS 12 (+1) CHA 20 (+5)
Skills Deception +9, Insight +5, Perception +5, Persuasion +9, Stealth +7 Damage Resistances Cold, Fire, Lightning, Poison; Bludgeoning, Piercing, and Slashing from Nonmagical Attacks Senses Darkvision 60 ft., Passive Perception 15 Languages Abyssal, Common, Infernal, Telepathy 60 ft. Challenge 4 (1,100 XP) Proficiency Bonus +2
Telepathic Bond. The fiend ignores the range restriction on its telepathy when communicating with a creature it has charmed. The two don't even need to be on the same plane of existence.
Shapechanger. The fiend can use its action to polymorph into a Small or Medium humanoid, or back into its true form. Without wings, the fiend loses its flying speed. Other than its size and speed, 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.
Actions Claw (Fiend Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: (1d6 + 3) slashing damage.
Charm. One humanoid the fiend can see within 30 feet of it must succeed on a DC 15 Wisdom saving throw or be magically charmed for 1 day. The charmed target obeys the fiend's verbal or telepathic commands. If the target suffers any harm or receives a suicidal command, it can repeat the saving throw, ending the effect on a success. If the target successfully saves against the effect, or if the effect on it ends, the target is immune to this fiend's Charm for the next 24 hours.
The fiend can have only one target charmed at a time. If it charms another, the effect on the previous target ends.
Draining Kiss. The fiend kisses a creature charmed by it or a willing creature. The target must make a DC 15 Constitution saving throw against this magic, taking (5d6 + 5) psychic damage on a failed save, or half as much damage on a successful one. The target's hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.
Etherealness. The fiend magically enters the Ethereal Plane from the Material Plane, or vice versa.