Hey,
yes, 12 is the maximum Number of Horns of Abudance you can have on one private Allod. You can create a private Allod on every of your Reincarnations and on each Allod you can have up to 12 Horns.
Embrium can be used for a variety of useful Items, like Equip of the current sector, Insignias, Gold and many more. Also some cosmetics like Titles and Pets.
You can also recieve Embrium through Mazes, if you successfully plunder them, so Charakters that do not have the main Allods can also recieve Embrium.
Best regards,
Poloo
Allods Online Moderator Team