Due to a lack of aging, Ethereals have grown incredibly intelligent and wise, learning from the downfall of other races and nations. Your Intelligence increases by 2 and your Wisdom increases by 1.

The consciousness of an Ethereal awakens suddenly, determined and competent. They have difficulty remembering when and how they were created, as they only appear as faint memories. Ethereals can live indefinitely if not killed. As they awaken fully realized, as it were, age is a vague concept at best for most Ethereals. 

Due to the myriad years Ethereals spend on the Material Plane, they tend not to fall cleanly into a singular alignment. Still, most are influenced in this regard by what they see working for society, which means Ethereals are quite heavily influenced by their surroundings.

Ethereals typically stand at a perfect 6'6 ft. This rarely varies, and if it does, it is usually what they wear to bind themselves to the realm that is to blame. 

Due to their ethereal bodies, Ethereals are capable of short-term flight even while bound by their choice of armors and cloths that help solidify their forms. You move at a normal pace when walking (30 ft.), but can also use 20 ft. of Flying movement.

Ethereals are known for their keen eyes (though they lack physical ones....),  and excel at reading others due to a lifetime of experience. You gain proficiency in Insight. 

Due to their inorganic bodies, Ethereals have immunity to poisons and natural diseases. However, as their body is bound in cloth and armor, Acid attacks prove difficult for them. Acid attacks made on an Ethereal have advantage, and Ethereals have disadvantage to Saving Throws involving Acid damage. 

Similarly to an Elf, Ethereals have no need for sleep, instead having what they call a Cycling, where they wind through all their memories within a 4-hour period, which helps them recall events from even hundreds of years ago with relative clarity. This still counts as a Long Rest, and during the Cycling, the Ethereal is still fully aware of their surroundings. 

While Ethereals use their makeshift bodies to interact with the physical world, they sometimes require a different approach. By leaving their bodies behind, Ethereals enter their natural gaseous form. In this state, they can slip through even the smallest of cracks, have advantage on Stealth checks, and are immune to Bludgeoning, Slashing, or Piercing damage that is non-magical. They also gain 60 ft. of Flying speed, which takes over their natural 20 ft.

However, if you do not return within 2 hours, your consciousness is brought back to your unknown home Plane, to be assimilated by the mass consciousness present there. After this feature is used, it cannot be used again until after a Long Rest.