Ahtal-Ka

Legendary Resistance (3/Day). If the ahtal-ka fails a saving throw, it can choose to succeed instead.

Golden Silk. When a creature makes a melee weapon attack against the ahtal-ka's webbing and misses, the weapon becomes stuck to it, requiring an action and a successful DC 19 Strength check to pull free.

Magic Resistance. The ahtal-ka has advantage on saving throws against spells and other magical effects.

Paragon Creature. The ahtal-ka counts as a number of creatures equal to it's paragon multiplier (3 counting the ahtal-nest) for the purposes of determining combat encounters. The XP value for a ahtal-ka is multiplied by it's paragon multiplier.

Reel in. The ahtal-ka has a 10-foot beam on its back. When it throws the rusted beam it can pull it back to itself as a bonus action. Any creature in the path of the beam as it is pulled in must make a DC 26 Dexterity saving throw, taking 40 (9d8) bludgeoning damage on a failed save, or half as much on a successful one.

Multiattack. The ahtal-ka uses its dragonator lance and then makes four attacks: one claw swipe attack, two rusty beam attacks, and one spiderweb burst attack.

Claw swipe. Melee Weapon Attack: +16 to hit, reach 10 ft., one target. Hit: 19 (3d6 + 9) slashing damage. If there is another creature within 5 feet of the target, the other creature must make a DC 26 Dexterity saving throw, taking 19 (3d6+9) slashing damage on a failed save.

Rusted Beam. Melee Weapon Attack: +16 to hit, reach 20 ft., one target. Hit: 27 (4d8 + 9) bludgeoning damage.

Dragonator Lance. The ahtal-ka pulls a 20-foot long by 5-foot wide dragonator lance from the ground within 15 feet of it. It then sends it flying along a 120-foot line. Each creature along the line must make a DC 20 Dexterity saving throw, taking 22 (4d10) piercing damage on a failed save, or half as much on a successful one.

Throw (Recharge 5-6). The ahtal-ka uses its claws to pull its webbing attached to the rusted beam sending it crashing down in a 10-foot cube within 60 feet of it. Each creature within the 10-foot cube must make a DC 26 Dexterity saving throw. On a failed save the creature is knocked prone and takes 40 (9d8) bludgeoning damage. On a successful save, the target takes half as much damage and is not knocked prone.

Spiderweb burst. Melee Weapon Attack: +16 to hit, reach 80/320 ft., one target. Hit: The target is Restrained by golden webbing. As an action, the Restrained target can make a DC 19 Strength check, bursting the webbing on a success. The webbing can also be attacked and destroyed (AC 20; hp 40; vulnerability to fire damage; immunity to bludgeoning, poison, and psychic damage).

Scatter Webs (Recharge 6). The ahtal-ka releases ten 120-foot long 5-foot wide strands of golden webbing from its abdomen. Each strand goes in a different direction and if it impacts a hard surface, such as a wall, it immediately stops creating a line of webbing. Any creature that starts its turn within the line or moves into it for the first time, must make a DC 26 Dexterity saving throw or they are restrained by the webbing. As an action, the Restrained target can make a DC 19 Strength check, bursting the webbing on a success. The webbing can also be attacked and destroyed (AC 20; hp 40; vulnerability to fire damage; immunity to bludgeoning, poison, and psychic damage).

Paragon Trait

Paragon Fortitude. The ahtal-ka has multiple pools of hit points, each which is tracked separately. Damage and healing only applies to the current hit point pool. When a pool is depleted of all hit points, it becomes inactive. When this happens, the ahtal-ka immediately saves against all ongoing conditions and effects. If all hit point pools are inactive, the ahtal-ka dies. When it takes a long rest, the ahtal-ka heals all hit points in the current pool and fully heals one depleted hit point pool.

Paragon Fury. The ahtal-ka rolls initiative with advantage. The ahtal-ka starts with 1 paragon action. If a hit point pool is depleted, the ahtal-ka gains one additional paragon action. The ahtal-ka may use a paragon action after any other creature takes a turn. If the ahtal-ka does so, they regain their reaction. A paragon action is a complete turn. They have an action, bonus action and may move up to their full speed. The paragon actions refresh at the start of the ahtal-ka's turn and any remaining actions from the previous turn are lost.

Paragon Transformation. When the first pool of hit points becomes inactive, the ahtal-ka wrap itself in a cocoon and pull its collection of scrap metal, debris, and silk forming "walking fortress" known as the Ahtal-Nest. The ahtal-nest stat block can be found below. 
  When the ahtal-nest is destroyed or if it is unable to form it, the ahtal-ka enrages. While enraged, the ahtal-ka changes as follows:

It gains the following abilities:

• Dragonator Barrier. Four dragonators constantly spin 5 feet above the ahtal-ka with the point of the lance cutting into the ground. When a creature starts its turn within 10 feet of the ahtal-ka or enters a space within 10 feet of the ahtal-ka for the first time on a turn they take 14 (2d6) slashing damage.
• Freedom of Movement. The ahtal-ka ignores difficult terrain, and magical effects can't reduce its speed or cause it to be restrained. It can spend 5 feet of movement to escape from nonmagical restraints or being grappled.

Its gains the following action:

• Dragonator Swarm. The ahtal-ka pulls out six dragonators from the ground attached to it by golden threads. When it uses this action, and as a bonus action on subsequent turns, the ahtal-ka can hurl up to two dragonators to a location within 120 feet of it. Each creature within 5 feet of the location must make a DC 26 Dexterity saving throw. The dragonator deals 22 (4d10) piercing damage on a failed save, or half as much damage on a successful save.

The following action change:

• Rusted Beam attack is renamed to Rusted Wheel.
• Multiattack. The ahtal-ka makes 5 attacks; two spiderweb burst attacks, one claw swipe attack, and two rusted wheel attacks.
• Throw (Recharge 5-6). The ahtal-ka throws the 20-foot tall, 5-foot wide rusted wheel on its back. The rusted wheel travels along the ground for 120 feet in any direction. The ahtal-ka travels with the wheel without provoking attacks of opportunity, pulling it onto its back when the wheel stops. If the rusted wheel enters a creatures space during its travel, that creature must make a DC 26 Dexterity saving throw. On a failed save the creature is knocked prone and takes 81 (18d8) bludgeoning damage. On a successful save the creature takes half as much damage and is not knocked prone.