maybe a different ability would work better.. giving any creature devour is way to overpowered as so .. sarcastically posted above.
if you do keep it as devour i suggest you add in only to creatures with idk 4 or 5 HP or lower can be targeted by this spell. then its like making an oty but it wont work on the high defense creatures..
maybe give momentum idk.. we already have that and its cheap so why pay more for it unless giving the
element change is a bonus, which right now is not.
could be a
stat boost? +2|+4.. keep to gravity usually having more defense.