I suppose it's a little late, but welcome to Hel. You're... the first person I've heard of switching Houses, but to be fair, I haven't been here that long. I'm sure it's likely that at least one other person has switched as well.

I've been using my shadow control powers to shape my shadow into a spear, so maybe you could focus on weapons? Spears, swords, naginatas... things like that. It'd cover both defense and offense since weapons are pretty versatile by nature.