Magearna (5e Creature)
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Medium construct, lawful neutral
Skills History +11, Insight +10
Soul-Heart. When Magearna reduces a creature to 0 hit points, it can gain temporary hit points equal to half the creature's hit point maximum. While Magearna has temporary hit points from this ability, it has advantage on attack rolls.
Immutable Form. Magearna is immune to any spell or effect that would alter its form.
Magic Resistance. Magearna has advantage on saving throws against spells and other magical effects.
Magic Weapons. Magearna's weapon attacks are magical.
Multiattack. Magearna makes one slam attack and one attack with its flash cannon.
Slam. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 18 (3d8 + 5) bludgeoning damage.
Flash Cannon. Ranged Spell Attack: +11 to hit, range 80/320 ft., one target. Hit: 18 (3d8 + 5) force damage.
Fleur Cannon (Recharge 5-6). Magearna releases a beam of light in a 60-foot line that is 10 feet wide. Each creature in that line must succeed a DC 19 Dexterity saving throw or take 44 (8d10) radiant damage and be outlined in light for 1 minute. On a successful save, a creature takes half as much damage and isn't outlined. The effect outlines objects in the area. For the duration, objects and affected creatures shed dim light in a 10-foot radius. Additionally, any attack roll against an affected creature or object has advantage if the attacker can see it, and the affected creature or object can't benefit from being invisible.
Heart Swap. In response to a creature within 30 feet of Magearna making an attack roll, ability check, or saving throw with advantage, Magearna forces the creature to reroll the attack roll, ability check, or saving throw without advantage, and Magearna has advantage on the next attack roll, ability check, or saving throw it makes.
Magearna 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. Magearna regains spent legendary actions at the start of its turn.
Attack. Magearna makes one slam attack or makes one attack with its flash cannon.
Move. Magearna moves up to its speed.
Synchronoise (Costs 3 Actions). All creatures within 30 feet of Magearna take 14 (4d6) force damage. Magearna can choose any number of creatures within that radius to instead regain the same number of hit points.