It's a condition for distance between 2 objects. You can use it to make enemies only die when they are close to the player. By default, it uses a "greater than" number, but you should invert it so only enemies under a range will die.
Thank you for the feedback I couldn't get it to work by inverting it but adding a minus seems to work you cant use orb attack tell the enemy is close enough now not sure if that's what you were talking about.
A negative works the same as inverting should, but with inverting, it'd be a distance greater than. My apologies because this is backwards for what you want. Glad you figured it out though.