That's not rule change, it is just rule. You can't teleport into vault. Not even when you are already in the vault. That's what actually makes vault a vault: no easy access. Vaults are also the only place in the dungeon where you can encounter permanent walls (besides town and dungeon borders).
For consistence reasons that teleport rule should work for monsters too, tele-to or phase door for them should result you or it outside of vault, and teleport away should also always move monster outside of the vault.
For consistence reasons that teleport rule should work for monsters too, tele-to or phase door for them should result you or it outside of vault, and teleport away should also always move monster outside of the vault.
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