Sendrak

Large aberration, chaotic evil

Armor Class 18 (natural armor)
Hit Points 178 (17d10+85)
Speed 40 ft., climb 40 ft., fly 80 ft.

STR	DEX	CON	INT	WIS	CHA
23 (+6)	10 (+0)	21 (+5)	14 (+2)	11 (+0)	19 (+4)

Saving Throws Dex +4, Con +9, Wis +4, Cha +8
Damage Immunities force
Condition Immunities charmed, exhaustion, frightened, paralyzed, petrified, poisoned
Senses blindsight 30 ft., darkvision 120 ft., passive Perception 18
Languages None
Challenge 10 (5,900 XP)

Actions

• Multiattack. Makes three attacks: one with its bite and two with its claws.
• Bite. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) piercing damage plus 3 (1d6) force damage.
• Claw. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) slashing damage.
• Nightmare Rays. Shoots two of the following nightmare rays at random (1d4, reroll duplicates), choosing one or two targets it can see within 120 ft. of it:
• 1. Mute Ray. The targeted creature must succeed on a DC 14 Wisdom saving throw or be lose the ability to comprehend language for 1d4 rounds. The targeted creature cannot speak or understand spoken words. All spells cast with a verbal component fail.
• 2. Immobility Ray. The targeted creature must succeed on a DC 14 Constitution saving throw or be stunned for 1d4 rounds. The creature can still speak and cast spells that only require a verbal component.
• 3. Strange Ray. The targeted creature must succeed on a DC 14 Intelligence saving throw or lose all knowledge of their allies for 1d4 rounds, seeing strangers who’ve replaced their friends.
• 4. Aging Ray. The targeted creature must succeed on a DC 14 Charisma saving throw or physically age to an extreme level for 1d4 rounds. Attack rolls and physical ability checks (Str, Dex, Con) are now made at disadvantage and movement speed is halved.

About

A nightmarish approximation of a dragon, with an elongated black translucent body shimmering with power and diaphanous wings glistening with coursing sinew.

A sendrak is a nightmare-made-flesh, manifested in the world by an entity of chaos and madness to break down the barrier between the material plane and the world of dreams.