A good single hit phys Spell?

Is there a decent single-hit phys spell for later in the game?
I planned out maybe trying a blood mage, which did seem to incentivise physical damage, but upon inspection of the options, nothing non-channeling seems to exist. Elemental just has more options, and I don't know of corresponding phys conversions.
Also, armour break on spells seems subpar, and Vulnerability is a joke.

Should I just re-plan to take elemental nodes instead?