Lagiacrus (5e Creature)
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Gargantuan beast, neutral
Saving Throws Str +14, Dex +13
Amphibious. The lagiacrus can breathe air and water.
Enrage. The lagiacrus will enter a ragelike state when it drops below half of its max hit points. When this happens, it gains advantage on all Strength and Dexterity checks, and increases its land and water speeds by 20. All of its attacks deal an additional 1d6 lightning damage.
Siege Monster. The lagiacrus deals double damage to objects and structures.
Swallow. The lagiacrus attempts to swallow a creature grappled in its jaws. The target must make a DC 24 Strength saving throw or be swallowed by the lagiacrus. While inside the stomach of the lagiacrus, the creature takes 4d12 acid damage at the end of each of its turns. If the lagiacrus takes 40 damage or more from the inside in one turn, it spits the creature out. The lagiacrus can only have one creature swallowed at a time.
Claw. Melee Weapon Attack: +15 to hit, reach 15 ft., one target. Hit: 14 (3d4 + 8) slashing damage. The Lagiacrus makes a claw attack with a reach of 17 feet, dealing 7 (3d4) slashing damage on a hit.
Coiled Strike (3/Day). Melee Weapon Attack: Can be used in water or on land. The Lagiacrus coils its body, gathering its strength for a few seconds before (a) on land it lunges towards an opponent and snaps its jaws around them for 26 (4d12) piercing damage, or (b) in water it darts very quickly at the opponent, dealing 26 (4d12) damage as well as 17 (5d6) cold damage to opponents within 10 feet, from the icy waters whipping around them. If Discharge is active, lightning damage is added to the attack, shown in the Discharge description.
Discharge. Can only be used in water. The Lagiacrus can use the spikes on its back as an electricity conductor, gathering electric molecules from the surrounding water. After doing this, it is able to discharge the electricity, affecting an area of 30 feet around itself as the electricity arcs in a fantastic display. If it gathers electricity once, it deals 11 (2d10) lightning damage. Twice, it deals 22 (4d10) lightning damage. And 3 times, it deals 33 (6d10) lightning damage.
Paralyzing Spit. Can be used in water or on land. The Lagiacrus can quickly spit a ball of electricity at an opponent, rolling to hit as with a normal ranged attack. If hit the target makes a Constitution saving throw (DC 22)). It takes 11 (2d10) lightning damage on a failed save, and is paralyzed for three rounds. It can roll against paralysis on each of its turns. On a successful save, it takes half damage and is not paralyzed.
The lagiacrus 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 lagiacrus regains spent legendary actions at the start of its turn.
Legendary Resistance. The lagiacrus can choose to succeed a failed saving throw three times per long rest.
The lagiacrus is a gargantuan creature, average size 125 feet, but ancient lagiacrus can reach titan-like sizes as they age. It prefers to make its lair in massive underwater caverns. Its striking blue scales make it blend into water easily, striking its prey quickly before it can react. Few creatures that have encountered a lagiacrus have escaped alive, most simply becoming prey to the massive beast. Legends and ballads sung of the monster have given it the title "Lord of the Seas."