Av2:AirBubble

Air Bubble is an airbending ability that surrounds your body in a bubble of air stopping all incoming projectiles. This ability costs a lot of chi to create and maintain. It has two actions (indicated in the crosshair), left clicking expands the bubble and destroys it, knocking enemies back and right clicking contracts the bubble, dissipating it.

This ability requires a tier III airbending scroll or tier III universal scroll to unlock.

Level II
Increases the strength of the air bubble.

This ability upgrade requires a tier III scroll.

Level III
Increases the strength of the air bubble by even more.

This ability upgrade requires a tier III scroll.

Level IV
As with all other  abilities, there are two choices for Air Bubble's level IV upgrade.

Tempest Wall: The bubble has infinite health and can only be broken when damage exceeds chi cost.

Tempest Wall grants an infinite bubble that can only be destroyed when the user runs out of chi. This upgrade is recommended for airbenders who would like to use this ability for an extended duration.

This ability upgrade requires a tier V scroll.

Undercurrent: Limited hovering (disabled through sneaking).

This upgrade allows you to hover over 1 block above your current level Y. It can be used to cross over lava or to hover across bodies of water. This ability is recommended for airbenders who want a visual change to this ability.

Mechanics
You can use this ability to cool down lava. Lava turns into stone or obsidian if it comes into contact with the air bubble.