The construct is consider Gargantuan in size
It gains triple its health pool.
You can choose a number of willing creatures equal to your Intelligence, Wisdom or Charisma + Proficiency bonus to be teleported inside of a demi-pane within the construct. You have total cover while within this demi-plane and the construct. Other creatures may choose to cast spells through though you as if they piloted the construct. Ranged melee attacks are blocked while within the demi-plan unless the choose to leave.
If the construct is reduced to 0hp, you can make a charisma saving throw. DC of 20. On a success the construct regains 1 hp. You can use this features amount of times equal to your Intelligence, Wisdom or Charisma + Proficiency bonus.