How to create a trigger-based grenade

This is a really specific Blueprint question because I cannot for the life of me find a good up-to-date answer on this:

I want to create an event where my FPS character (as per the base FPS model from Unreal) walks into a cube which signals a sphere to not only fall but also explode after 5 seconds, killing/hurting the player when near it. I don’t care about particle effects or anything. The sphere falls at a pre-determined area away from the player.