The Fighter
In AranoX, a fighter doesn’t have much need of a heavy armor under the blistering sun. That and the fact that it is really hard to gather enough steel to create full plate armor, created a new generation of fighters. These fighters spend less time working with armor and hardening their skin and spend more time on learning different skills that might be useful instead.
Because she spends more time learning skills than honing combat her prowess, she undergoes the following changes:
Class Features: They don't get the heavy armor proficiency;
Feats: They don't get the free feat at first level. They only get the feats at every even level. Skill Points: They get 4+INT skill points per level;
Class Skills: Their class skill list now includes: Bluff (cha), Climb (str), Craft (int), Handle Animal (cha), Jump (str), Listen (wis), Ride (dex), Search (int), Spot (wis), Swim (str).

You do not have to play the alt. fighter. You can still be a regular one, only you won't benefit much from having the heavy armor proficiency.