Thaumaturgy as a form of magic requires very special materials in its focus, specifically bone / metal topped with a gemstone. Without this, it'll either not work, or you'll hurt yourself.
Apparently WHM during 1.0 had control over Ice, but considering there are some people who believe the 1.0 lore was retconned, and the fact that there is much debate over whether one can be a WHM at all, I'm not going to touch that in my post.
TL;DR, Umbral Ice requires a focus made out of THM materials, as far as we can tell (unless you eat a crystal and become Shiva I guess).
Apparently WHM during 1.0 had control over Ice, but considering there are some people who believe the 1.0 lore was retconned, and the fact that there is much debate over whether one can be a WHM at all, I'm not going to touch that in my post.
TL;DR, Umbral Ice requires a focus made out of THM materials, as far as we can tell (unless you eat a crystal and become Shiva I guess).
