Biweekly Monster-Cosmic Dragon

It came like a field of stars falling from the night sky and while all stared in wonder, the world became a chaos of buffeting bedrolls, crashing rock, and swirling embers. It must not have been too hungry, it only took two horses.

Even stories of cosmic dragons are incredibly rare. The dragons look like a field of stars and arise only in the most momentous of occasions, often trying to prevent the moment of change and maintain the status quo. Enjoy all four age categories:

Cosmic Dragon Wyrmling
Medium dragon, chaotic neutral
Armor Class: 14
Hit Points: 65 (10d8 + 20)
Speed: 30 ft., climb 30 ft., fly 60 ft.

STR DEX CON INT WIS CHA
10 (+0) 19 (+4) 15 (+2) 12 (+1) 11 (+0) 15 (+2)

Saving Throws: Dex +6, Con +4, Wis +2, Cha +2
Skills: Perception +4, Stealth +6
Damage Resistances: bludgeoning, slashing, piercing
Senses: blindsight 10 ft., darkvision 60ft., passive Perception 14
Languages: Draconic
Challenge: 4 (1,100 XP)
Star Camouflage. The dragon has advantage on Dexterity (Stealth) checks made to hide against the night sky.

Actions
Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 9 (1d10 + 4) piercing damage plus 3 (1d6) psychic damage.
Gravity Breath (Recharge 5-6). The dragon exhales to create a gravity well in a 15-foot cone. Each creature in that area must make a DC 13 Dexterity saving throw, taking 21 (6d6) bludgeoning damage and are knocked prone on a failed save, or half as much damage on a successful one. Objects in the area suffer the same damage and are tossed about, possibly creating hazardous terrain or other other effects.

Young Cosmic Dragon
Large Dragon, chaotic neutral
Armor Class: 16
Hit Points: 161 (17d10 + 68)
Speed: 40 ft., climb 40 ft., fly 80 ft.

STR DEX CON INT WIS CHA
12 (+1) 23 (+6) 19 (+4) 14 (+2) 11 (+0) 19 (+4)

Saving Throws: Dex +10, Con +8, Wis +4, Cha +8
Skills: Perception +8, Stealth +10
Damage Resistances: bludgeoning, piercing, slashing
Senses: blindsight 30 ft., darkvision 120 ft., passive Perception 18
Languages: Common, Draconic
Challenge: 10 (5,900 XP)
Star Camouflage. The dragon has advantage on Dexterity (Stealth) checks made to hide against the night sky.

Actions
Multiattack. The dragon 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) psychic damage.
Claw. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) slashing damage.
Gravity Breath (Recharge 5-6). The dragon exhales to create a gravity well in a 15-foot cone. Each creature in that area must make a DC 13 Dexterity saving throw, taking 21 (6d6) bludgeoning damage and are knocked prone on a failed save, or half as much damage on a successful one. Objects in the area suffer the same damage and are tossed about, possibly creating hazardous terrain or other effects.

Adult Cosmic Dragon
Huge Dragon, chaotic neutral
Armor Class: 18
Hit Points: 237 (19d12 + 114)
Speed: 40 ft., climb 40 ft., fly 80 ft.

STR DEX CON INT WIS CHA
14 (+2) 27 (+8) 23 (+6) 16 (+3) 13 (+1) 21 (+5)

Saving Throws: Dex +14, Con +12, Wis +7, Cha +11
Skills: Perception +13, Stealth +14
Damage Resistances: bludgeoning, piercing, slashing
Senses: blindsight 30 ft., darkvision 120 ft., passive Perception 23
Languages: Common, Draconic
Challenge: 17 (18,000 XP)
Star Camouflage. The dragon has advantage on Dexterity (Stealth) checks made to hide against the night sky.
Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.

Actions
Multiattack. The dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.
Bite.
 Melee Weapon Attack:
 +14 to hit, reach 10 ft., one target. Hit: 19 (2d10 + 8) piercing damage plus 7 (2d6) psychic damage.
Claw. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: 15 (2d6 + 8) slashing damage.
Tail. Melee Weapon Attack: +14 to hit, reach 15 ft., one target. Hit: the target must succeed on a DC 15 Charisma saving throw or be sent to a random plane of existence. The target remains there for 1 minute, at which point the target reappears in the space it left or in the nearest unoccupied space if that space is occupied.
Frightful Presence. Each creature of the dragon’s choice that is within 120 feet of the dragon and aware of it must succeed on a DC 19 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature’s saving throw is successful or the effect ends for it, the creature is immune to the dragon’s Frightful Presence for the next 24 hours.
Gravity Breath (Recharge 5-6). The dragon exhales to create a gravity well in a 60-foot cone. Each creature in that area must make a DC 21 Dexterity saving throw, taking 56 (16d6) bludgeoning damage and are knocked prone on a failed save, or half as much damage on a successful one. Objects in the area suffer the same damage and are tossed about, possibly creating hazardous terrain or other effects.

Legendary Actions
The dragon can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. The dragon regains spent legendary actions at the start of its turn.
Detect. The dragon makes a Wisdom (Perception) check.
Tail Attack. The dragon makes a tail attack.
Wing Attack (Costs 2 Actions). The dragon beats its wings. Each creature within 10 feet of the dragon must succeed on a DC 22 Dexterity saving throw or take 15 (2d6 + 8) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.

Ancient Cosmic Dragon
Gargantuan Dragon, chaotic neutral
Armor Class: 20
Hit Points: 518 (28d20 + 224)
Speed: 40 ft., climb 40 ft., fly 80 ft.

STR DEX CON INT WIS CHA
16 (+3) 30 (+10) 27 (+8) 18 (+4) 15 (+2) 23 (+6)

Saving Throws: Dex +17, Con +15, Wis +9, Cha +13
Skills: Perception +16, Stealth +17
Damage Resistances: bludgeoning, piercing, slashing
Senses: blindsight 60 ft., darkvision 120 ft., passive Perception 26
Languages: Common, Draconic
Challenge: 24 (62,000 XP)
Star Camouflage. The dragon has advantage on Dexterity (Stealth) checks made to hide against the night sky.
Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.

Actions
Multiattack. The dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.
Bite.
 Melee Weapon Attack:
 +17 to hit, reach 15 ft., one target. Hit: 21 (2d10 + 10) piercing damage plus 14 (4d6) psychic damage.
Claw. Melee Weapon Attack: +17 to hit, reach 10 ft., one target. Hit: 17 (2d6 + 10) slashing damage.
Tail. Melee Weapon Attack: +17 to hit, reach 20 ft., one target. Hit: the target must succeed on a DC 16 Charisma saving throw or be sent to a random plane of existence. The target remains there for 1 minute, at which point the target reappears in the space it left or in the nearest unoccupied space if that space is occupied.
Frightful Presence. Each creature of the dragon’s choice that is within 120 feet of the dragon and aware of it must succeed on a DC 21 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature’s saving throw is successful or the effect ends for it, the creature is immune to the dragon’s Frightful Presence for the next 24 hours.
Gravity Breath (Recharge 5-6). The dragon exhales to create a gravity well in a 90-foot cone. Each creature in that area must make a DC 24 Dexterity saving throw, taking 84 (24d6) bludgeoning damage and are knocked prone on a failed save, or half as much damage on a successful one. Objects in the area suffer the same damage and are tossed about, possibly creating hazardous terrain or other effects.

Legendary Actions
The dragon can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. The dragon regains spent legendary actions at the start of its turn.
Detect. The dragon makes a Wisdom (Perception) check.
Tail Attack. The dragon makes a tail attack.
Wing Attack (Costs 2 Actions). The dragon beats its wings. Each creature within 15 feet of the dragon must succeed on a DC 25 Dexterity saving throw or take 17 (2d6 + 10) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.

Posted a little late in the day, but I couldn’t just put out a simple creature when the final boss of the Tyranny of Mundanity campaign was calling to be created for 5e. Mind Weave dragons get significantly larger, but I hope this has a similar impact in your game.

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