FX targeting the background?

Admittedly I am new to roll20, and macroing. However, I have been learning quite a bit in the past 2 days. Goal: I am trying to create a macro with the fireball skill and fx's on the background instead of a token_id. This is because the spell can be cast anywhere. Instead of token_id is there a back_ground option? If so, what are all my options for targeting? I did a search for this on roll20, no results for what I want. Example code: /fx nova-fire @{target|Foe|token_id} @{target|Caster|token_id}

There isn't.  GMs can use the FX Tool to create effects anywhere.  Players and users of the /fx command require a token as a marker.  You could create an invisible token (100% transparent png) and drop that where you want to make the effect, but that starts to get a bit tedious.

Thanks Aaron!

The Aaron said: There isn't.  GMs can use the FX Tool to create effects anywhere.  Players and users of the /fx command require a token as a marker.  You could create an invisible token (100% transparent png) and drop that where you want to make the effect, but that starts to get a bit tedious. I mainly use this method for traps (fireball traps in particular) where I want a /fx beam-fire and a custom explosion effect on the transparent PNG I aptly call BigExplosion. It works great and doesn't clutter up space much. I keep these invisible tokens on the gmlayer. Don't forget to give it an aura so you can see it (but nobody else can unless specified otherwise)