Love the Vaults of Vaarn stuff. Have to bring it to the table over if these days. Plus the new, forthcoming deluxe edition looks so fantastic.
MagnumGalaxy
Some elixirs (AKA potions) from Vaults of Vaarn 2E. These require components taken from the bodies of dead monsters, so anything you encounter with a cool or annoying power can be rendered down into a single use dose of that ability. Potency 5 elixirs can permanently change or upgrade the character