SFS Standard Nimbus Ward [reaction] or [one-action] Feat 4

Trigger You would be damage by an attack, spell, or other effect.
Requirements You're aware of the triggering effect and not off-guard.

You harness your solar nimbus to protect yourself from harm. You gain resistance equal to half your level (rounded up) until the start of your next turn. You choose the type of resistance when you use this action, depending on your current attunement.

You can use Nimbus Ward as a reaction only when the requirements and trigger are met, but you can use it as a 1-action activity without the requirements or trigger being met.

Graviton-Attuned Your resistance can be one of the following types of damage: bludgeoning, force, piercing, or slashing.

Photon-Attuned Your resistance can be one of the following types of energy damage: acid, cold, electricity, fire, or sonic.