![](http://elementscommunity.org/images/Cards/RayOfLight.png)
![](http://elementscommunity.org/images/Cards/Damselfly.png)
![](http://elementscommunity.org/images/Cards/GnomeGemfinder.png)
![](http://elementscommunity.org/images/Cards/BrimstoneEater.png)
Why is brimstone eater the only fodder creature with a cost? I've never thought of this even while using fire rush, because I used photons or gemfinders for immo fodder, but coming to think of it, the cost might be part of the reason for that.
EDIT: Thanks a lot Higurashi for the response to my previous question ![Smiley :)](https://elementscommunity.org/forum/Smileys/solosmileys/smiley.gif)
IMHO it's because upgraded they get only one more "skill". Skill may be cost reduction or quanta production.
Photon is costless but skill-less, upped as Ray of Light it gets the quanta production.
Dragonfly produces quanta unupped but costs 1
![Air :air](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/air18x18.png)
, upped as Damselfly loses its cost.
Gnome Rider produces quanta unupped but costs 1
![Earth :earth](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/earth18x18.png)
, upped as Gnome Gemfined it loses its cost.
Ash Eater, instead, costs 1
![Fire :fire](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/fire18x18.png)
and has no skill, upped it either gets the quanta production or loses its cost. Apparently, theme-wisely, they chose the quanta production.