Having object appear as a reaction

I need an object, a magic rune circle, to appear when a character token goes over it. From the tutorials Ive watched, I see a lot of making object disappear/fade, but not the opposite.  Im sure im just missing something obvious, but there is a lot of new stuff I need to sift through. Thanks

If you set the initial opacity to 0% and the reaction opacity to 100%, it will be invisible until a token overlaps it. 

ok, next question would how do I set the initial opacity to 0%?

N/M. I found it in token settings. thought it would be in the same menu area as reactions. but got it. Thanks for the help.

Now the problem is, now that ive set the base opacity to 0%, I cant see it either. is there a way to fix that?

Maybe try It's a Trap. It is in one click.

Give the token a 0 radius aura that only you the GM can see. Set the aura in the token settings, then it the aura's three-dot menu make sure that "see" is not checked. At Mark L said: Now the problem is, now that ive set the base opacity to 0%, I cant see it either. is there a way to fix that?

Hultz (Keeper of Secrets) said: Maybe try It's a Trap. It is in one click. I dont know what that means

Rick A. said: Give the token a 0 radius aura that only you the GM can see. Set the aura in the token settings, then it the aura's three-dot menu make sure that "see" is not checked. At Mark L said: Now the problem is, now that ive set the base opacity to 0%, I cant see it either. is there a way to fix that? That almost worked. Unfortunately, the Aura turned invisible too once I deselected it and wouldnt come back.

also, aura doesnt seem to work show if its on map layer, which is where I'd prefer to keep such things

"It's a Trap" is a MOD/ API  script. Being on the "one click" means that it's in the MOD library so it can be installed to your game directly from the MOD/API screen of your game instead of needing to be copied from an outside source like github. Mark L said: Hultz (Keeper of Secrets) said: Maybe try It's a Trap. It is in one click. I dont know what that means

Rick A. said: "It's a Trap" is a MOD/ API  script. Being on the "one click" means that it's in the MOD library so it can be installed to your game directly from the MOD/API screen of your game instead of needing to be copied from an outside source like github. Mark L said: Hultz (Keeper of Secrets) said: Maybe try It's a Trap. It is in one click. I dont know what that means You need Roll20 Pro subscription to use API Mods and the One-Click 

Rick A. said: "It's a Trap" is a MOD/ API  script. Being on the "one click" means that it's in the MOD library so it can be installed to your game directly from the MOD/API screen of your game instead of needing to be copied from an outside source like github. Mark L said: Hultz (Keeper of Secrets) said: Maybe try It's a Trap. It is in one click. I dont know what that means Thanks for being specific. I havent done much other than the stock set up, but I probably should at some point to really take advantage of the online tools.