It isn't, no. It's a drop in the water to the level cultists can use it on, also.

[He knows this more intimately than the conversation suggests. It's hard to think it was nearly a year ago since that mission where he met the General, and they were dragged into that dream world. The potency of the filial magic they could use in there was startling.]

Not being able to match them in strength doesn't mean it can't be used effectively, however. A well-aimed stone can kill as easily as a boulder, and all.