How to create a simple BP for an enemy to slow his movement speed down when he is going over a box collision which should trigger this ?

[itsmemoulder]

Regarding overlapping multiple triggers. There is a way you can fix it I’m just not too sure myself how. Something along the lines of checking if the other actor is already overlapping that trigger. If so don’t apply any further speed reduction.
But I’m not sure how to go about that.

Some sweet R and D will get you through that part.