Arania Queen

Legendary Resistance (2/Day). If the Queen Arania fails a saving throw, it can choose to succeed instead.

Multiple Heads. The Arania Queen Possesses 2 head giving her Advantage on Perception rolls.

Unusual Nature. As she possesses two heads the Queen doesn't need to sleep as she can alternate her head sleeping cycle.

Colonial Thelepathy. The Queen is able to speak telepathically.

Multiattack. The Queen Arania makes three attacks.

Bite Attack. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 17 (2d8 + 8) Piecing damage plus 11 (2d10) Poison damage. 

Limb Attack. Melee Weapon Attack: +12 to hit, reach 15 ft., one target. Hit: 15 (2d8 + 6)  Piercing damage.

Boulder Flail Attack. RangedWeapon Attack: +12 to hit, range 60/120 ft., one target. Hit: 31 (3d12 + 12) Bludgeoning damage. Using her webs, the Queen attaches a boulder and swings it like a flail.

Corrosive Venom Drench (Recharge 5-6). The Arania Queen ejects out two massive corrossive venom balls from her mouths up to 175 ft away. The corrossive venom lands and bursts in a 5ft radius sphere. Each creature in that area must make a DC 19 Dexterity saving throw. On a failed save, the creature takes 59 (12d8 + 10) Poison Damage plus 23 (4d8+6) Acid damage and they must make a DC 21 Constitution saving throw or become poisoned and blinded until they make the saving throw at the end of each of their turn. On a successful save, the creature takes half as much damage, and isn't poisoned and blinded. Any creature that failed the Dexterity saving throw and is wearing armor will have their armor corroded and their effectivness are reduced (-1 AC for armor and -1 AC for shield if any. This does not affect Magical Armor and shields).

Warding Screech (Recharge 4-6). The Arania Queen bellows out a horrifying screech, trying to ward them off her territory. Any creatures within 100 who can hear this must make a DC 17 Charisma Saving throw. On a Failure, the creature becomes frightened for 1 minute. On a success the creature isn't frightened. A creature who failed this can remake the Saving throw at the end of each of their turn.

The Queen has 5 Legendary Actions points she can use 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. She regains 1 Legendary Action point at the start of her turn.

Attack. The Queen can make 2 Limb Attacks or 1 Bite Attack

Spider Aid (Costs 2 Actions). The Queen summons 2 Giant Spiders to aid her in defending the colony.

Corrossive Venom Drench (Costs 3 Actions) (Recharges 3-6). The Queen can make a Corrossive Venom Drench Attack if it was not used during her last turn as a normal Action.