OTOH it can make dangerous ordinary room with item too easy. You just TO item out of there and go hunt it from other place. Repeat until it is safe to get it.
TO in GV:s isn't that easy. At least in larger GV:s TO usually means that you are in LoS of the monster as well.
Of course we could make monsters in vaults resistant to TO. You can't banish them, destroy them or teleport them. Vault could be "magical place protected against all kinds of robbery", which means no method of magically move things other than yourself.
Then again that could make GV:s just very annoying instead of exhilarating and exciting. Some things in the game should be easy. Just not too common. Extraordinary unexpected finds can make game fun, be it monster or item. Not everything needs to be hard to get to keep game interesting.
TO in GV:s isn't that easy. At least in larger GV:s TO usually means that you are in LoS of the monster as well.
Of course we could make monsters in vaults resistant to TO. You can't banish them, destroy them or teleport them. Vault could be "magical place protected against all kinds of robbery", which means no method of magically move things other than yourself.
Then again that could make GV:s just very annoying instead of exhilarating and exciting. Some things in the game should be easy. Just not too common. Extraordinary unexpected finds can make game fun, be it monster or item. Not everything needs to be hard to get to keep game interesting.
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