How do you have an object disappear xxx seconds after it has been spawned?

[RecourseDesign]

That could be a navmesh thing, check out this post:

AI won't drop off ledges or climb stairs

Hi! to fix your problem you can use 3 solutions: You can use NavLink Actors (you can find it in your mode tab looking for Nav Link Proxy) and connect the points A and B at the start and the end of your stairs. You can use it even for make the AI jump off the ledges. You can edit your NavMesh parameters from Edit/ProjectSettings/Engine/Navigation Mesh. I’m not sure what parameter fix your problem, I can guess Cell Height or Agent height. You can fix your stairs collision to a ramp, you…