Ethering

Ethering is a Spark that appears in Mario + Rabbids Sparks of Hope. It is a light-blue ghost-like Spark with red eyes, a blue tongue and a blue, fiery aura surrounding it. Its Power is Unseen, which makes a Hero invisible for at least one turn. While a Hero is invisible, enemies cannot directly target them, but the Hero can still take damage and be affected by Super Effects. Its Bonus is Athlete, which increases the damage of move abilities.

Mario + Rabbids Sparks of Hope website
''Did you ever wonder what it's like to be invisible? Ethering is your Spark. By its side, your hero moves unseen by enemies for one turn. Spooky!''