How to make Boss attack hit-indicators so players can predict attacks?

Help and Feedback Scripting Support
1

Hello everyone, how to I make attack warnings or indicators for bosses to warn players of incoming attacks to make everything more fair?

Something like valorsnts ability indicators, such as brimstone ult or sova ult. I can send references if needed but you can just Google them.

2

Make something appear on the ground before the attack happends.