Talk:Magic Items/@comment-28344602-20180205153608/@comment-24859896-20180205180513

The Book of Building can be used in both Builder Base and Home Village.

You can use it to complete any level of upgrade you so choose, however it may only be used once. For example, you can use it to complete an upgrade of lvl 6 to lvl 7, but not lvl 7 to lvl 8 unless you have another book