Hello everybody! My group has arrived at mordenkainen transplanar tower and i was wondering what fun stuff you'd place there.

Whats mordenkainen transplanar tower? Well, I decided that this old, knowledgeable wizard that travels the planes to keep balance wouldn't default to a simple planeshift and MMM combo when traveling the planar landscape: He utilizes a floating tower defended by an antimagic field and a puzzle door... sound familiar doesn't it?

I have the entry figured out and some of the stuff the party may find within (Some creatures from the creature codex) But what do you think the wizard may want to take along during his planar travels? Of course, there will be a few spellbooks, one for each important planar trip, a couple of magical items to lend to companions, and perhaps some potions. But i want to bring in some stuff my players won't recognize as my brand of homebrew.
So, ideas?