Crenelated walls and archways...where are they?

[INCONCEIVABLE]

I am working on a purge build, but I do not see crenelated walls or archways as options for Black Ice. I have the Master Mason knowledge which I found is all you need, but these are still not build options. Have they been removed?

[Ellorien]

Crenellations must be unlocked in the knowledge menu. There have never been any archways in the black ice set.

[INCONCEIVABLE]

Thank you! I find crenelated walls in Knowledge, but not for Black Ice?! Also, I think I am thinking of the vaulted walls/ceilings where it looks like a "half arch" wall. I don't see that either.

[thurgond]

Unlock crenelations under master mason and it will unlock for both reinforced stone and black ice plus any DLC sets you own.

Black Ice does not have any vaulted ceiling pieces. Vaulted pieces are all in DLC sets.

[INCONCEIVABLE]

I just realized you have to research the siege cauldron to get the crenelated black ice walls. I think the vaulted walls from stormglass work well with the black ice build pieces.