In case people hadn't noticed it yet, all etchable weapons gained a second element to etch with the last update.
I've only checked a few weapons so far, but it appears that if the first element was fire-lightning-wind-dark the added element is light. If it was earth-water-ice-light, the added element is dark.
For instance, Ebony Wand+1 used to be Fire FilledTriangleDown 6, it's now Fire/Light FilledTriangleDown 6.
Check your vaults for etchable weapons and update ffxiclopedia when you got a few spare minutes.