What creates collision checks?

I am working on my tile game and I did a ctrl-f to look for collision events in my game across all of my event sheets. I do not have any. So I am curious what other events cause collision checks?

I have bullets, particles, and moveTos but they are all based on a trigger, not automatic and not repeating every X number of seconds. I also have NPCs moving based on tile movement but I don't have any sprites for them to possibly collide with. No block behaviors.

Thanks

Yeah, I am just trying to figure out why my numbers are so different from that Demonoire game sample. That game is larger and has far less checks.

There's something I am just not seeing. There will be a lightbulb moment coming.

I isolated it to one of my global GUI layers. So it's not something occurring directly on the map itself.

Yep! Here is the culprit. I made a unit selected info GUI and it has all the possible buffs/debuffs in the game counting down as well as listening for mouse event on the map to open and an escape key to close. Under normal conditions, a unit would not possibly have all of these debuffs at once but I was learning how to do this so I had been keeping some test/learning kind of stuff around.

Sidenote: I know it may not be kosher to change the thread up but all of those icons you see on the pic below are a sprite that just has different frames. Would it be better practice to make a tilemap with as much of them as possible and put a tilemap in instead of all the instances of the same sprite?