Dragon, Brine (Adult)

Large dragon, lawful neutral

Armor Class 17 (natural armor)
Hit Points 142 (24d10+60)
Speed 30 ft., fly 80 ft., swim 80 ft.

24 (+7) 11 (+0) 19 (+4) 19 (+4) 16 (+3) 17 (+3)

Saving Throws Cha +7, Dex +4, Int +8, Str +12
Damage Immunities acid
Skills Athletics +12, Perception +7, Stealth +4
Senses blindsense 60 ft., darkvision 120 ft., passive Perception 17
Languages Aquan, Common, Draconic
Challenge 11 (7,200 XP)


  • Amphibious. The dragon can breathe air and water.
  • Innate Spellcasting. The dragon’s spell casting ability is Intelligence (spell save DC 16). It can innately cast the following spells, requiring no material components:
  • Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.
  • Bite. Melee Weapon Attack: +8 to hit, 10 ft. reach, one target. Hit: 18 (2d10 + 7) piercing damage plus 9 (2d8) acid damage.
  • Claw. Melee Weapon Attack: +8 to hit, 10 ft. reach, one target. Hit: 10 (1d6 + 7) slashing damage.
  • Tail. Melee Weapon Attack: +8 to hit, 10 ft. reach, one target. Hit: 10 (1d6 + 7) bludgeoning damage.
  • Acid Breath (Recharge 5-6). The dragon exhales acid in a 60-foot line that is 5 feet wide. Each creature in that line must make a DC 17 Dexterity saving throw, taking 35 (10d6) acid damage on a failed save, or half as much damage on a successful one.


  • Multiattack. The dragon makes one attack with its bite and two with its claws.
  • Touch of the Sea (3/day). The dragon touches an adjacent creature. That creature gains a swim speed of 30 feet for 8 hours. This does not give the creature the ability to breathe underwater.


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. The dragon beats its wings. Each creature within 10 feet of the dragon must succeed on a DC 17 Dexterity saving throw or take 13 (2d6 + 8) bludgeoning damage and be forced prone. The dragon can then fly up to half its flying speed.


Section 15: Copyright Notice

Boricubos: The Lost Isles (5E) © 2021, Legendary Games; Author: Miguel Colon.

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