Amphibious. The leviathan can breathe air and water.
Guardian of the Crossing. The Auroral Leviathan instinctively senses creatures carrying violent intent or emotional discord. It always knows the location of creatures currently concentrating on spells within 120 feet while in water.
River Glide. While submerged, the leviathan ignores difficult terrain caused by water, rapids, or currents. Opportunity attacks against it are made with disadvantage while it is in water.
Sacred Momentum. If the leviathan moves at least 40 feet straight toward a target before hitting it with a Bite or Tail attack, the target must succeed on a DC 20 Strength saving throw or be knocked prone or pushed up to 15 feet.
On the boat, a creature pushed to the edge must immediately make a DC 15 Dexterity saving throw or fall overboard.
Aura of Tranquil Terror. Creatures of the leviathan’s choice that begin their turn within 20 feet of it must succeed on a DC 17 Wisdom saving throw or suffer overwhelming awe until the start of their next turn. While under this effect their speed becomes 0, the cannot take reactions, and they have Disadvantage on attacks against the leviathan. A creature that succeeds is immune to this aura for 24 hours.
Multiattack. The leviathan makes two attacks: one with its Bite and one with its Tail Sweep.
Bite. Melee Weapon Attack: +12 to hit, reach 15 ft., one target. Hit: 25 (3d10 + 9) piercing damage plus 10 (3d6) radiant damage. If the target is Large or smaller, it is grappled (escape DC 18). Until this grapple ends, the target is restrained. The leviathan cannot Bite another target while grappling.
Tail Sweep. Melee Weapon Attack: +12 to hit, reach 20 ft., all creatures in a 20-foot line originating from the leviathan. Hit: 19 (3d8 + 6) bludgeoning damage. Targets must succeed on a DC 20 Strength or Dexterity saving throw (target’s choice) or fall prone and slide 10 feet. Creatures already prone slide an additional 10 feet.
Antler of Dawn. Melee Weapon Attack: +12 to hit, reach 15 ft., one target. Hit: 21 (3d8 + 8) piercing damage plus 13 (3d8) radiant damage and the target must succeed on a DC 18 Constitution saving throw or become Marked by Dawn until the end of the leviathan’s next turn.
While Marked the creature sheds dim golden light, cannot benefit from invisibility, and the next attack against it has advantage.
Celestial Lance. Ranged Spell Attack: +10 to hit, range 120 ft., one target. Hit: 27 (6d8) radiant damage, and the next attack roll made against the target before the end of the leviathan’s next turn has advantage.
Constellation Wake (Recharge 5–6). The leviathan dives beneath the surface, vanishing entirely. Lines of golden light suddenly begin racing beneath the water in enormous geometric patterns. Three 40-foot-long, 5-foot-wide lines appear on the battlefield.
At initiative count 20 next round each line erupts into radiant pillars. Creatures in the lines make a DC 18 Dexterity save, taking 31 (7d8) radiant damage on failure, or half on a success.
Dive Beneath. While in water, the leviathan may move up to half its swim speed without provoking opportunity attacks. If it fully submerges during this movement, ranged attacks against it are made with disadvantage until the start of its next turn.
Rolling Wake. When hit by a ranged attack, the leviathan thrashes the river around itself. Each creature standing on the boat must succeed on a DC 16 Dexterity saving throw or fall prone.
The Auroral Leviathan 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.
Detect. The leviathan makes a Wisdom (Perception) check.
Current Shift. The leviathan moves up to half its swim speed.
Astral Dive (Costs 2 Actions). The leviathan phases partially beneath the luminous surface. Until the start of its next turn it gains resistance to all damage except force, may move through creatures and the ferry, and emits dim starlight in a 30-foot radius. Creatures it passes through take 10 (3d6) radiant damage and hear fragments of ancient whale-song in their minds.
Radiant Pulse (Costs 3 Actions). Light erupts from the leviathan’s body. Creatures of its choice within 15 feet must succeed on a DC 17 Constitution saving throw or take 14 (4d6) radiant damage and become blinded until the end of their next turn.
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