Quote:the rod can only be activated once per week.I'm pretty sure you have to spend at least a week outside for every 200 days you spend inside. I would assume the time spent inside doesn't count for the recharge time.
I have heard this argument before, but that isn't how the entry reads. The Rod of Security does not stop time at all. One must still eat and drink while in the paradise as indicated by the presence of food and water. There is no reason all your items won't recharge and the entry says "the rod can only be activated once per week." It does not say you must wait one week. This is probably meant to keep you from jumping in and out of the paradise as a combat-safety zone.
If you are level 20, you can become immortal. You can also start throwing Wish spells around. A well-crafted wish could probably "change your true form to that of an immortal X." Even if you sacrificed 19 caster levels to become a hatchling dragon, you end up with "time enough at last" and the youth and vitality to claw your way back up the power tree.
But you can do that AND do your plan, indeed if you're immortal you can take it that much further with demiplanes and permanent gates. Moreover a permanent demiplane Has more options and more clearly-defined interactions with other magic, like plane shift.
If you're going the BBEG route, it makes even more sense. An ancient and powerful wizard, ten thousand years old, squatting in a timeless demiplane. The moment he leaves he will turn to dust, but as long as he remains he is safe. For millenia he has plotted, sending out simulacra, doing business deals, and raising a cult in his name. Now he's sending his avatars and his servants to hunt for mythic creatures. His intention is to bring the mythic critters to his demiplane, kill them (thus completing a mythic challenge) and gain both immortality and the ability to grant spells from the appropriate mythic abilities.
If his god complex has progressed enough, he'll also be investigating the Starstone, or other means of ascension. In spite of Paizo's general rule of keeping divinity mysterious and statless there are several ways mortals have ascended.
Thanks for the thought! Unfortunately for my future BBEG, my friends don't use anything but the Core and APG as I mentioned at the start. It started as a rule by the GM in this wizard's campaign and after finding all the easy, broken abilities in the Ultimate books, I tend to agree. That means no Immortality discovery or Create Demiplane.
I like the idea of trying to Wish for immortality, but as I would do with a player, I think I may have this one go wrong since that is clearly beyond the defined abilities. Hmm, this could lead to him getting stuck in a timeless space as suggested. Yesssss... I like that. Now he needs a McGuffin like the Starstone to attain true immortality. This has possibilities. Thanks again!