How do I make a safe zone like in Fortnite or PUBG?

I am starting to make my own battle royale game and i dont know how to make the “safe zone” or “battle royale circle”.
How can i make it moving? How can the zone hurt the character?

Thanks for help

Hey,

if this is a circle for example then create some material make actor with a sphere (Big sphere) and check if player is in this sphere with begin/end overlap events. Than if not call some damage function. This should work fine.

To decrease circle simply set scale to a bit smaller every frame.

Hello i would suggest using a timeline for Shrinking its way smoother!