Dragon, Brine (Ancient)

Huge dragon, lawful neutral

Armor Class 19 (natural armor)
Hit Points 225 (18d12+108)
Speed 30 ft., fly 80 ft., swim 80 ft.

30 (+10) 11 (+0) 23 (+6) 23 (+6) 20 (+5) 21 (+5)

Saving Throws Cha +11, Dex +6, Int +12, Str +16
Damage Immunities acid
Skills Athletics +16, Perception +11, Stealth +6
Senses blindsense 60 ft., darkvision 120 ft., passive Perception 21
Languages Aquan, Common, Draconic
Challenge 17 (18,000 XP)



  • 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: +10 to hit, 15 ft. reach, one target. Hit: 32 (4d10 + 10) piercing damage plus 9 (2d8) acid damage.
  • Claw. Melee Weapon Attack: +10 to hit, 15 ft. reach, one target. Hit: 13 (1d6 + 10) slashing damage.
  • Tail. Melee Weapon Attack: +10 to hit, 15 ft. reach, one target. Hit: 13 (1d6 + 10) bludgeoning damage.
  • Acid Breath (Recharge 5-6). The dragon exhales acid in a 90?foot line that is 10 feet wide. Each creature in that line must make a DC 19 Dexterity saving throw, taking 52 (15d6) acid damage on a failed save, or half as much damage on a successful one.
  • 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.
  • 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 19 Dexterity saving throw or take 13 (2d6 + 10) bludgeoning damage and be forced prone. The dragon can then fly up to half its flying speed.


Although not inherently evil, brine dragons have little patience for kindness and philanthropy. As they age, they grow more and more opinionated and obsessed with power-by adult age, a brine dragon counts itself a failure if it doesn’t rule over a collection of “lesser beings” such as humans, merfolk, locathah, or even sahuagin. Their blue-green neck frills sweep back from their heads, leading to a body of dark, shiny scales and fin-like crests. Brine dragons prefer salt water but can venture into fresh water and onto land in desperation when prey is scarce.

Section 15: Copyright Notice

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

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