Press tilde (~) to open the console in game, and use these cheats to do various things. Just start the game with -console added to the shortcut command line.

The other clan that has this option is Gangrel. If you click accept after your potence discipline is reduced to less than 0 (either -1 or -2) the discipline will vanish from your inventory forever. Clicking it again will give you another 10 XP. Move your cursor over Animalism and go back to Potence. When you start playing, you can click the word Potence, and you will receive 10 XP. The History 'Boogeyman' reduces Potence to 0.