note Two races, Gnomes and Trolls, can't become Warriors or Wizards. Races which can't join all three guilds (notably, the Giants and Osiri mentioned above) are advised to join all of the guilds they can to complete whichever portions of the route are available to them. Only two of the nine races are able to join all three guilds: Humans (which can join every guild) and Dwarves (helping to bolster their reputation for excellence). This requires the character to join and then reach level 28 as a Warrior, then reacquaint with the starting Nomad guild and reach level 30, and finally join the Wizard guild and reach level 41. The Optimal Leveling Route maximizes early hit point gain, which is critical in deep dungeon runs.
Generally experienced players will only create a character belonging to another race for role-playing or for challenges.