XPLvl/HD        1        2        4        6        8        10        12       14        16        18...    
 BaseSave      16      15      14      13      12       11        10        9          8          7...    

Fighters Advantage vs Mostly Dead Saves*, Poison/Venom, and Transformation Magic (Polymorph, Petrifaction, Withering) *if using Death Save rules at negative HP

Magic Users

Advantage vs Spells, and most Magic Item effects
Clerics Advantage vs all forms of Mental and Emotional influence or control, and vs magical Paralysis and Hold Spells  
Thieves
Advantage vs Area Effects, Breath Weapons, and other Dodge-ables


[Image]  saint-george-and-the-dragon-daniel-eskridge