Oxygen

You can't breathe without a good tank of clean air 😉

None of the known planets has a breathable atmosphere, therefore you will need to bring your own oxygen to breathe in the Essence extraction missions, each tank has a fixed duration.

On the closest planets, the Essence deposits are much closer to the landing sites, since they have been visited for years and are well mapped, therefore reaching an essence deposit on planet 1 should be enough with only 1 tank of pure oxygen.

For the more distant planets, make sure you have a VERY good oxygen reserve since, being less frequented planets, the deposits are not very well mapped, which could lead to oxygen running out before returning to your ship and having to pay for a rescue.