Aid

You try to help your ally with a task. To use this reaction, you must first prepare to help, usually by using an action during your turn.

Trigger An ally is about to use an action that requires a skill check or attack roll.

Requirements The ally is willing to accept your aid, and you have prepared to help (see below).

You try to help your ally with a task. To use this reaction, you must first prepare to help, usually by using an action during your turn. You must explain to the GM exactly how you're trying to help, and they determine whether you can Aid your ally.