Elemental touch-buff or touch spell?
Unlike other touch spells, this one has a range of "personal" and a target of "you". Am I right to read this as a buff rather than a touch spell (i.e. you don't have to hold the charge for this)?
Also, if it is a buff, then each casting would not be an identical spell effect, but rather a different effect altogether provided you cast it choosing a different element. So wouldn't you be able to cast it four times, making your fist/touch/claw deal 1d6 of each element, with 4 fort saves against 4 separate effects?