This is my big concern. I hope the feats aren't quite so fiddly in their final form as the ones shown here. I can see the 'reduce to 0' thing being forgotten on a regular basis. The 'take -5 deal double damage' I don't mind, since it's a choice a player has. But things that trigger and must be remembered should go away...
Agreed. Ideally a feat should have one good static ability, one good activated ability, and zero triggered abilities. So instead of having that trigger, the feat should allow maybe an attack at two targets at once at a -2 penalty or something like that.
I also don't like that the reliance on ability scores seems to be creeping back. Get rid of Con bonus to DR thing and either make it based on level, or on AC, or static number.
Heavy Armor Master
Prerequisite: Proficiency with medium armor
Benefits:
1. You have proficiency with heavy armor. If you were already proficient with heavy armor before taking this feat, instead you can ignore up to 2 points of check penalties a heavy armor you wear induces.
2. When you are wearing heavy armor, you have a +1 bonus to AC, and you reduce all bludgeoning, piercing, and slashing damage you take by an amount equal to the AC bonus granted by your armor.
Great Weapon Master
Prerequisite: Proficiency with simple weapons?
Benefits:
1. You gain proficiency in heavy martial weapons. If you were already proficient with heavy martial weapons before taking this feat, instead you deal extra damage equal to your class attack bonus with heavy martial weapons.
2. When you make a melee attack with a weapon, you can take any penalty to the attack roll. If you do, for each point of penalty you either deal +2 damage with that attack or you attack one additional target that's within range (regardless of number of targets you still make one attack with a single attack roll).