Templar with both heralds of ice and fire

Hello everyone! Just wondering if Templar with both herald of ice and fire is viable? What to use as a main skill? Share your opinions.

I built a super glass cannon EK scion with both heralds and wrath. Not much mana left to play with, but 7L in a pledge it was destroying everything.

TLDR: physical damage based, big damage strikes > lots of little hits to get the most out of it (the bigger the damage on overkill, the better the ignite). Ele prol on herald of ash at a min, but it increases the reserved cost. But if you were pushing ignite damage, go flameblast.

Kind of underwhelmed by them so far. If you want to build around them, other skills do it better for the nodes needed to utilise. And then, why not just use a superior dps aura?

Im thinking about Power Syphon with double herald but not sure if heralds will work with culling mechanics