The base for many elements will rely on triggering off an invisible actor appearing or casting an ability. These are a few different ways that invisible actors can be explored.

Log

AOEs on the ground are often generated by an invisible actor casting the ability at the location. Many times this will appear in the log before the AOE shows up in-game.

For example, in P11S the boss will cast Jury Overwhelming which spawns delayed AOEs under every player's feet at the end of the cast. Slowing down the fight in duty recorder reveals in the log that 8 invisible NPCs spawn and start casting the followup AOEs at the end of the main boss's cast.

To make an element using this information, data could be entered in this way. This will display donuts under every player's feet at the end of the Jury Overwhelming (Dark) cast.

Find

The Find tab under Tools can also be used to explore actors in the field. Adding a searched object with * and checking "Include Untargetable" will allow you to see all current actors in the field.

This will draw flashing orange/red lines from your character to every actor currently spawned.

Logger and Explorer

Enabling the logger tab will keep a list of actors that spawn. Clicking the find button will tether your character to that actor in the field.

These actors can be further explored in the Explorer tab. Here more data is listed about said actor, such as what they are casting and any statuses they may have.

This could be used to show the AOE emanating from that untargetable enemy by specifying to only show while casting 33518 (Ray of Light), drawing a line 45y from the direction the enemy is facing (account for rotation) like so: