Vaults are taking minimal damage from Bombs and no damage from trebs (we tested demon fire and boulders) or Orbs on official pvp servers. Bombs are only hitting vaults for a few hundred damage per bomb so the bomb investment seems way too high considering the cheap cost of a vault. I have not seen this flagged as a bug yet but hopefully you guys are aware and working on a patch before launch. If it remains unfixed the vault spam will be cancer.
Thanks for all the hard work!