Windcutter Ballista

Huge object Armor Class: 15 Hit Points: 200 Damage immunities: poison, psychic
Ensnaring Shot: Ranged Weapon Attack: +8 to hit, range 120/480 ft., one target. Hit: 27 (5dl0) piercing damage. When a large or smaller creature is hit with the bolt, the two chains attached to it ensnare the creature and force him to make a DC 13 Dexterity saving throw or be restrained.
A creature can remove the chain by making a successful DC 15 Strength or Dexterity check as an action.
Shielding Area. The ballista can be aimed to shoot