I have been stewing over this for a while, and I thought I'd just write it down and see what everyone else thought about it.
The problem: Melee builds have little-to-no survivability in legendary elite quests in quests in reaper mode above 5-skull due to high enemy damage and comparatively lower play defenses.
Other problems: Buffing melee does nothing because multiclassing can always exploit class-specific buffs. With this, you end up having melee in the same position they are in and ranged and caster builds gaining more defenses than they need.
My solution: Class-based and level-based passive feats that work ONLY when wielding a melee weapon in your main hand.
Some details:
Artificer: Arcane Defenses
For every artificer class level you possess, you gain a +1 bonus to physical and magical resistance ratings. Additionally, for every two artificer class levels you possess you gain a +1 bonus to armor class. This feat is only in effect if you are wielding a melee weapon in your main hand or have a two-handed melee weapon equipped.
Barbarian: Anger Management
For every barbarian class level you possess, you gain a +1 bonus to physical resistance rating and a +2 bonus to positive healing amplification. Additionally, for every three barbarian class levels you possess, you gain a +1% bonus to your dodge. This feat is only in effect if you are wielding a melee weapon in your main hand or have a two-handed melee weapon equipped.
Bard: Musically Defensive
For every bard class level you possess, you gain a +1 bonus to armor class. Additionally, for every two bard class levels you posses you gain a +1 bonus to physical resistance rating and +1% bonus to dodge. This feat is only in effect if you are wielding a melee weapon in your main hand or have a two-handed melee weapon equipped.
Cleric / Favored Soul: Divine Providence
For every cleric or favored soul class level you posses, you gain a +1 bonus to physical resistance rating. Having a shield equipped further increases your armor class by +1 for every two cleric or favored soul class levels you possess. This feat is only in effect if you are wielding a melee weapon in your main hand or have a two-handed melee weapon equipped.
Druid: Natural Protection
For every two druid class levels you possess, you gain a +1 bonus to physical resistance rating and a +1 bonus to armor class. If you are in an animal shape-shifting form, you gain an additional +1 bonus to physical resistance rating for every two druid class levels you possess. This feat is only in effect if you are wielding a melee weapon in your main hand, have a two-handed melee weapon equipped, or are in an animal shape-shifting form.
Fighter: Militant Defender
For every fighter class level you possess, you gain a +1 bonus to physical resistance rating and a +1 bonus to armor class. If you have a shield equipped you also gain a +1 bonus to magical resistance rating for every two fighter class levels you possess. This feat is only in effect if you are wielding a melee weapon in your main hand or have a two-handed melee weapon equipped.
Monk: Iron Body
For every monk class level you possess, you gain a +2 bonus to armor class. Additionally, for every two monk class levels you posses you gain a +1% bonus to dodge. This feat is only in effect if you are wielding a melee weapon in your main hand, are using handwraps, or have a two-handed melee weapon equipped.
Paladin: Faithful Guardian
For every paladin class level you possess, you gain a +1 bonus to physical resistance rating and a +1 bonus to armor class. If you have a shield equipped you also gain a +1 bonus to magical resistance rating for every two paladin class levels you possess. This feat is only in effect if you are wielding a melee weapon in your main hand or have a two-handed melee weapon equipped.
Ranger: Block and Parry
For every two ranger class levels you posses, you gain a +1 bonus to physical resistance rating, a +1 bonus to armor class, and a +1% bonus to dodge. This feat is only in effect if you are wielding a melee weapon in your main hand or have a two-handed melee weapon equipped.
Rogue: Evasive Maneuvers
For every rogue class level you posses, you gain a +1 bonus to armor class. Additionally, for every two rogue class levels you posses, you gain a +1% bonus to dodge, and for every 3 rogue class levels you posses you gain a +1% bonus to maximum dodge. This feat is only in effect if you are wielding a melee weapon in your main hand or have a two-handed melee weapon equipped.
Not good? Too good? Questions? Comments?