The Empty Waste
Heavy armor is almost useless in the desert, especially in the summer months. Since much of this campaign will take place in the desert, I have devised some house rules for this issue.
First of all, there are NO Badawi characters that will start with the heavy armor proficiency. It is simply not used in the desert and the Badawi will never use or teach heavy armor use. Therefore, a character with the Badawi background will not get the armor proficiency, heavy feat, even if they would normally have such. Instead, a character who is a Badawi that would normally start off with armor proficiency, heavy gains the Defensive Desert Warrior feat which will make up for some of the lost AC. This feat grants the character a defensive AC bonus of +1 at 3rd level and again at 8th level, for a total of +2 to the AC while wearing medium or lighter armor. Please note, this AC bonus stacks with other potential AC bonus.
A Badawi character could later take the armor proficiency, heavy feat after he/she had an opportunity to train or travel with someone who had that proficiency. Likewise, a non-Badawi character could take the Defensive Desert Warrior feat after he/she had an opportunity to train or travel with a Badawi who has the feat.
Regardless of the character's actual feats, it will be almost impossible to wear heavy armor in the desert with the exception of winter months. Spells such as endure elements would not allow heavy armor to be worn, just as the endure elements would have no effect if someone cast Heat Metal on a fighter's armor. However, Resist Energy, fire and Protection from fire would allow heavy armor to be worn in the desert. Nevertheless, once the spell ends, the character wearing heavy armor would face AC penalties and would eventually take fire damage. Immunity to fire or fire resistance 10 or higher would allow heavy armor to be worn in the desert, even during the hottest months.
Defensive Desert Warrior:
You are skilled in the Badawi method of fighting that involves intricate weapon motions and the use of loose clothing to confound an opponent.
Prerequisite: Familiarity with the Badawi and normal access to armor proficiency, heavy.
Benefit: While wearing medium or light armor and wielding a melee weapon, you gain a defensive AC bonus of +1 at 3rd level and again at 8th level.