How to trigger a player condition when entering in a zone or a room ?

Hi folks

Lets say i created a box and when beginoverlap, the player will slowly lose stamina if he stays in that box.

It is similar to when you are cold and the freeze icon shows.

Another question, i tried to change colour of the fire animation “colour over life” but it still shows the stock colour. How do i do that?

Thank you guys !!