Cogstructs are very efficient. Every long rest, you set your daily efficiency rolls to 2. At any point of time, you can use these daily efficiency rolls to reroll a dexterity roll. To successfully reroll it, you must roll 1d4. If you land on an odd number, you will spend 1 daily efficiency roll and be able to reroll the dexterity roll. If you land on an even number, you will not spend a daily efficiency roll, but you will not be able to reroll the dexterity roll.

Cogstructs have heat seeking technology (courtesy of Krivv Verehex) which allows them to detect monsters and species through objects. Once per long rest, a Cogstruct may activate their heat seeking to see people and monsters through objects/materials.

You replace your gears and upgrade your metal. This will change your daily Efficiency rolls to 3, and will allow you to add +2 to one ability score of your choice: Strength, Charisma, or Dexterity.

Cogstructs can compress the magic in their core to protect their body from danger. Every day, the Cogstruct are allowed to spend one Durability roll, which is 1d8, to have resistance against all elemental and environmental effects for 3 turns. To activate this resistance, the Cogstruct must land on a 5 or higher, which will spend the Durability roll. If the Cogstruct lands on a 4 or below, they will not spend the Durability roll, they will not get the resistance, and they may not try to use a durability roll for 7 turns or 30 minutes.

When you reach 0 HP, your cogs begin working overtime to bring you back. In the meantime, you become inactive for 3 turns. If these 3 turns pass by without you taking any damage, you will come back to life with 3 HP. This ability may only be used once per long rest.