Unique. Instead of using the presented stats, you can instead use a point buy system with 84 points or a rolled system of 6d6 drop lowest. Also you can replace any of the listed Skill Proficiencies, except Perception and Stealth, with any skill, or gain expertise in skill you're already proficient in. Amphibious. The dragon can breathe air and water. Innate Charm. Any time a creature makes visual contact with the dragon or it's duplicate must make a DC 25 (8 + Prof + Cha) Wisdom saving throw or be charmed by the dragon until the start of it's next turn, a creature that is at a greater distance from the dragon gains a bonus to the save, if it's more than 30ft away from the dragon the bonus is +1, more than 60ft the bonus is +2, more than 100ft is +3, more 300ft is +4, more than 500ft is +5, more than 1000ft is +6, more than 2500ft is +7, more than a mile is +8 and the bonus increases by 1 for each mile beyond that. While charmed by this feature a creature regards the dragon as a close friend and does not need to make saves against this feature, if a creature succeeds on this save it becomes immune to this effect until the end of it's next turns Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.
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: +9 to hit, reach 15 ft., one target. Hit: (2d10 + 2) piercing damage plus (4d6)poison damage. Claw. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: (2d6 + 2) slashing damage. Tail. Melee Weapon Attack: +9 to hit, reach 20 ft., one target. Hit: (2d8 + 2) bludgeoning damage. Frightful Presence. Each creature of the dragon's choice that is within 120 feet of and aware of either the dragon or it's duplicate , the dragon chooses which each time it uses this ability, must succeed on a DC 25 (8 +Prof + Cha) 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. Poison Breath (Recharge 5-6). The dragon exhales poisonous gas in a 90-foot cone. Each creature in that area must make a DC 19 (9 + Prof + Con) Constitution saving throw, taking 77 (22d6) poison damage on a failed save, or half as much damage on a successful one. Change Shape. The Dragon magically polymorphs into a Humanoid or beast that has a Challenge rating no higher than its own, or back into its true form. It reverts to its true form if it dies. Any Equipment it is wearing or carrying is absorbed or borne by the new form (the dragon's choice). In a new form, the Dragon retains its Alignment, Hit Points, Hit Dice, ability to speak, Proficiencies, Legendary Resistance, lair Actions, and Intelligence, Wisdom, and Charisma scores, as well as this action. Its Statistics and capabilities are otherwise replaced by those of the new form, except any Class Features or legendary Actions of that form. Invoke Duplicate. The dragon creates an illusionary duplicate of itself at a point it can see within 500ft of it. The duplicate is a perfect recreation of the dragon at the time of creation including any object it is wearing or carrying, along with any sounds, smells, and temperature it would create, but it is intangible. A creature that uses its action to examine the duplicate can determine that it is an Illusion with a successful DC 22 (8 +Prof + Int) Intelligence (Investigation) check. The dragon can move the duplicate up to 80ft as a bonus action. This duplicate last for 1 hour or the dragon uses this ability again.
Adult Green 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. Adult Green Dragon regains spent legendary actions at the start of their turn. Detect. The dragon makes a Wisdom (Perception) check. Tail Attack. The dragon makes a tail attack. Shift. The dragon and it's duplicate teleport to each other's spaces, any object the dragon is wearing or carrying is teleported along with it. The dragon cannot take this action if another creature is occupying the duplicates space. Wing Attack (Costs 2 Actions). The dragon beats its wings. Each creature within 15 ft. of the dragon must succeed on a DC 17 (8 + Prof + Str) Dexterity saving throw or take 13 (2d6 + 6) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.
On initiative count 20 (losing initiative ties), the dragon takes a lair action to cause one of the following effects; the dragon can’t use the same effect two rounds in a row:
The forest-loving green dragons sometimes compete for territory with black dragons in marshy woods and with white dragons in subarctic taiga. However, a forest controlled by a green dragon is easy to spot. A perpetual fog hangs in the air in a legendary green dragon’s wood, carrying an acrid whiff of the creature’s poison breath. The moss-covered trees grow close together except where winding pathways trace their way like a maze into the heart of the forest. The light that reaches the forest floor carries an emerald green cast, and every sound seems muffled. At the center of its forest, a green dragon chooses a cave in a sheer cliff or hillside for its lair, preferring an entrance hidden from prying eyes. Some seek out cave mouths concealed behind waterfalls, or partly submerged caverns that can be accessed through lakes or streams. Others conceal the entrances to their lairs with vegetation.
The region containing a legendary green dragon’s lair is warped by the dragon’s magic, which creates one or more of the following effects: