Spirit weapon tab doesn't contain the piercing stat

None of the crossbows list the piercing stat under the spirit weapon section. Can't figure out how to edit it in. I verified it myself, that newly created xbow egos do have pierce.

I'll add it, but I have no idea about the values.

Regular ego xbow has the same pierce as it's non-ego counterpart. If someone who has a pre-revamp xbow ego can verify it doesn't have pierce, just like the regular crossbows, we can assume the pierce stat just carries over from the base weapon.