You gain resistance to lightning damage.
Whenever you gain an aethari trait, you can also choose from the following:
Whenever you take lightning damage from a level 1 spell or higher, you gain a number of temporary hit points equal to your training die that last until the start of your next turn.
When you take the Spellcast action with a level 1 spell or higher that deals damage, you can replace the spell's damage type with the lightning damage.
You have immunity to lightning damage.
You have damage threshold to lightning damage equal to your proficiency bonus.
You have a flying speed equal to your walking speed.
Level 1: Gust
Level 3: Feather Fall
Level 5: Levitate