Several major changes are apparent in Diablo III; compared to Diablo II, each character class has many more skills available to use (Diablo II had only a maximum of '''thirty''' skills per character), while in a single skill tree in Diablo III can have in excess of '''eighteen'''.  So far, it is not known if each skill tree will have the same number of skills for each character class, as it were in Diablo II (each skill tree had exactly ten skills), but from inferring what has been revealed already, a single skill tree ''may'' have more than '''twenty''' skills. Take for instance, the [[Wizard]]'s [[Conjuring Skill Tree]] - it has '''ninteen''' skills, distributed over '''four''' Tiers. There are a maximum of '''six''' Tiers, the skills in the final two Tiers have yet to be disclosed. You can look further at the above known class [[skills]] (in the [[Diablo_3_Basics#Character_Classes|Character Classes section]] on this page) for detailed information about what will be availablehas been revealed so far, but one big general user interface (UI) change for character abilities is that you skills are now have a accessed via '''skill bar instead ''', supplanting the functionality of a the potion barin Diablo II. It works similar to the skill bar in World of Warcraft (WoW), and where more than two skills can now be accessed easilywithout using the function hotkeys (F1, F2 etc). Read more about the [[potion]] changes below.