Title says it all - Inner Sea World Guide has a PRECAMPAIGN dependency on Ultimate Magic that's not needed by the source!
Also, ISWG depends on PF Bestiary, despite this being a tiny aspect of the source not needed for character creation. It would be a much better idea to pull this into a separate file & control loading via a specific PRECAMPAIGN (like Ultimate Equipment does with Ultimate Combat).
Removed Ultimate Magic dependency
Separated Bestiary dependency & controlled by PRECAMPAIGN