Aetheric Adaptation

You touch a creature and alter its form, allowing it to safely exist in the aetherial seas. For the spell's duration, the creature can breathe aether, is immune to the effects of aether poisoning, and has advantage on ability checks made to swim in aether.

If the creature is already suffering from aether poisoning, the creature's symptoms are suppressed and further progression of aether poisoning stages is halted for the spell's duration. This spell does not cure an aether-poisoned creature of the affliction

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you can target two additional creatures, and the spell's duration increases by 2 hours for each spell slot above 2nd.